diff --git a/README.md b/README.md
index b535d5b..b433d11 100644
--- a/README.md
+++ b/README.md
@@ -150,3 +150,16 @@ playing an episode or pressing the button still works. Settings -> Health shows
 - **Search what's said** (Podcast screen): finds a word or phrase in every transcript on the server and plays that episode from that moment. Only podcasts on your own list (and audiobooks) are searched; older transcripts are matched to their episode the first time.
 - **Recipes** (needs `MEALIE_TOKEN`; `MEALIE_URL` defaults to `https://mealie.necloud.us`): browse and search your Mealie recipes, read one (ingredients, steps, times), import a recipe from a web link, and add its ingredients to the Mealie shopping list (Mealie adds up repeats). The shopping list is also kept in **Tasks** as a "Shopping" list: ticking, adding or deleting an item in either place is carried over when either screen opens or an item changes. Turn the tab on per person in the admin screen.
 - **Contacts**: an address book per person (name, company, emails, phones, address, birthday, notes). Mail suggests contacts while you type a recipient, a message you are reading can be saved as a contact (or opens the one you have), birthdays appear in the Calendar, and .vcf files from iCloud, Google or a phone can be imported and exported.
+
+## Store
+
+One **Store** tab (turn it on per person) with sections for **Books** (the free book sources, Open Library and any OPDS catalogue), **Audiobooks** (LibriVox) and **Radio** (the station finder), each shown only to people who have that tab, plus **My Store**. The old Book store and Free audiobooks buttons now open the Store.
+
+**My Store** is your own catalogue, for everyone who has the Store tab. The admin adds items with **Add**: upload files, or copy a file from their Seafile (**From Files**), with an optional cover picture.
+- **Books** (EPUB, PDF, MOBI, AZW3, DOCX): *Add to my library* puts a copy on that person's shelf, or download it.
+- **Music** (MP3, M4A, AAC, FLAC, OGG, OPUS, WAV): an album can have many tracks; they play in the hub's player and can be downloaded.
+- **Apps**: any files to download (an APK, an installer...), with an optional link and version. The hub does not run them.
+- **Extensions**: one self-contained `.html` file that adds a feature to the hub. A person installs it from My Store and it opens inside the Store. It runs in a sandbox with no access to the hub's sign-in or data (and `connect-src https:` only), and talks to the hub through a small `hub` object: `hub.storage.get/set/all/remove` (its own settings for that person, up to 256 KB), `hub.user()` (the person's name), `hub.toast(text)` and `hub.open(url)`. See `docs/extensions/notepad.html` for a complete example.
+
+Files are kept in the data folder under `mystore/` (up to 1 GB each; extensions up to 2 MB). Only an admin can add, change or delete items.
+
diff --git a/docs/extensions/notepad.html b/docs/extensions/notepad.html
new file mode 100644
index 0000000..1014fbf
--- /dev/null
+++ b/docs/extensions/notepad.html
@@ -0,0 +1,5 @@
+<!doctype html><html><head><meta charset="utf-8"><title>Notepad</title><style>body{font-family:sans-serif;margin:12px}textarea{width:100%;height:200px}</style></head><body><h3>Notepad</h3><textarea id="t"></textarea><p id="who"></p><script>
+hub.user().then(function(u){document.getElementById('who').textContent='Hello '+u.name});
+hub.storage.get('note').then(function(v){document.getElementById('t').value=v||''});
+document.getElementById('t').oninput=function(e){hub.storage.set('note',e.target.value)};
+</script></body></html>
diff --git a/mystore.js b/mystore.js
new file mode 100644
index 0000000..44256b1
--- /dev/null
+++ b/mystore.js
@@ -0,0 +1,156 @@
+// My Store: a catalogue of your own content that everyone with the Store tab can use. The admin adds books, music, apps (files to download) and extensions
+// (small web apps that add features to the hub), by uploading files or copying them from their Seafile. Books go onto a person's shelf in one tap, music plays
+// in the hub's player, apps download, and extensions run in a sandbox of their own (an iframe with no access to the hub's sign-in or data; it gets a small
+// message bridge for its own saved settings, below). Items and files live in the data folder, shared by everyone.
+const fs = require('fs'), path = require('path'), crypto = require('crypto');
+const { pipeline } = require('stream/promises');
+const atomicWrite = require('./atomic');
+const users = require('./users'), settings = require('./settings'), books = require('./books');
+const { readBody } = require('./body');
+
+const DATA_DIR = process.env.DATA_DIR || path.join(__dirname, 'data');
+const ROOT = () => path.join(DATA_DIR, 'mystore'), ITEMS = () => path.join(ROOT(), 'items.json'), FILES = () => path.join(ROOT(), 'files');
+const SEAFILE = () => (process.env.SEAFILE_URL || 'https://seafile.necloud.us').replace(/\/$/, '');
+const MAX_FILE = 1024 * 1024 * 1024, MAX_COVER = 3 * 1024 * 1024, MAX_EXT = 2 * 1024 * 1024, MAX_STATE = 256 * 1024, MAX_FILES_PER_ITEM = 200;
+const KINDS = ['book', 'music', 'app', 'extension'];
+const BOOK_EXT = ['epub', 'pdf', 'mobi', 'azw3', 'azw', 'docx'];
+const TYPES = { epub: 'application/epub+zip', pdf: 'application/pdf', mobi: 'application/x-mobipocket-ebook', azw3: 'application/vnd.amazon.mobi8-ebook', azw: 'application/vnd.amazon.ebook', docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+  mp3: 'audio/mpeg', m4a: 'audio/mp4', aac: 'audio/aac', flac: 'audio/flac', ogg: 'audio/ogg', opus: 'audio/ogg', wav: 'audio/wav', html: 'text/html; charset=utf-8', apk: 'application/vnd.android.package-archive', zip: 'application/zip', dmg: 'application/x-apple-diskimage', exe: 'application/vnd.microsoft.portable-executable', pkg: 'application/octet-stream', txt: 'text/plain; charset=utf-8' };
+const IMAGE = { jpeg: 'image/jpeg', jpg: 'image/jpeg', png: 'image/png', gif: 'image/gif', webp: 'image/webp' };
+
+const json = (res, code, o) => { res.writeHead(code, { 'content-type': 'application/json', 'cache-control': 'no-store' }); res.end(JSON.stringify(o)); };
+const fail = (code, message) => Object.assign(new Error(message), { code });
+const str = (v, n) => String(v == null ? '' : v).replace(/[\u0000-\u0008\u000b\u000c\u000e-\u001f]/g, '').trim().slice(0, n);
+const idOk = s => /^[0-9a-f]{12}$/.test(s || '');
+const newId = () => crypto.randomBytes(6).toString('hex');
+const extOf = n => (/\.([A-Za-z0-9]{1,8})$/.exec(n) || [])[1] ? (/\.([A-Za-z0-9]{1,8})$/.exec(n))[1].toLowerCase() : '';
+const safeName = n => str(path.basename(String(n || 'file')), 160).replace(/[\\/:*?"<>|]+/g, '_') || 'file';
+const needAdmin = me => { if (!me || me.role !== 'admin') throw fail(403, 'Only an admin can change the store'); };
+
+const loadItems = () => { try { const j = JSON.parse(fs.readFileSync(ITEMS(), 'utf8')); return Array.isArray(j) ? j : []; } catch { return []; } };
+const saveItems = l => { fs.mkdirSync(FILES(), { recursive: true, mode: 0o700 }); atomicWrite(ITEMS(), JSON.stringify(l, null, 1), { mode: 0o600 }); };
+const fileOn = (item, fid) => path.join(FILES(), item.id + '-' + fid);
+const coverOn = item => path.join(FILES(), item.id + '-cover');
+const view = it => ({ id: it.id, kind: it.kind, title: it.title, creator: it.creator, description: it.description, version: it.version, url: it.url, cover: !!it.cover, added: it.added, updated: it.updated,
+  files: it.files.map(f => ({ id: f.id, name: f.name, size: f.size, ext: f.ext })), ...(it.kind === 'extension' ? { icon: it.icon || '' } : {}) });
+
+// ---- the per-person bits: which extensions are installed, and each extension's saved settings
+const stateFile = () => path.join(users.dir(), 'mystore.json');
+const stateOf = () => { try { const j = JSON.parse(fs.readFileSync(stateFile(), 'utf8')); return { installed: Array.isArray(j.installed) ? j.installed : [], data: j.data && typeof j.data === 'object' ? j.data : {} }; } catch { return { installed: [], data: {} }; } };
+const saveState = s => atomicWrite(stateFile(), JSON.stringify(s), { mode: 0o600 });
+
+/** Stream a stored file, with Range support so audio can be skipped through. */
+function send(req, res, file, type, name, download) {
+  let st; try { st = fs.statSync(file); } catch { return json(res, 404, { error: 'Not found' }); }
+  const h = { 'content-type': type, 'accept-ranges': 'bytes', 'cache-control': 'private, max-age=3600', 'x-content-type-options': 'nosniff' };
+  if (download) h['content-disposition'] = `attachment; filename="${name.replace(/[^\x20-\x7e]/g, '_').replace(/"/g, '')}"; filename*=UTF-8''${encodeURIComponent(name)}`;
+  const m = /^bytes=(\d*)-(\d*)$/.exec(req.headers.range || '');
+  if (m && (m[1] || m[2])) {
+    let a = m[1] ? +m[1] : Math.max(0, st.size - +m[2]), b = m[1] && m[2] ? Math.min(+m[2], st.size - 1) : st.size - 1;
+    if (a > b || a >= st.size) { res.writeHead(416, { 'content-range': 'bytes */' + st.size }); return res.end(); }
+    res.writeHead(206, { ...h, 'content-range': `bytes ${a}-${b}/${st.size}`, 'content-length': b - a + 1 }); return fs.createReadStream(file, { start: a, end: b }).pipe(res);
+  }
+  res.writeHead(200, { ...h, 'content-length': st.size }); fs.createReadStream(file).pipe(res);
+}
+/** Save a request body to a file, refusing more than `max` bytes. */
+async function receive(req, file, max) {
+  fs.mkdirSync(path.dirname(file), { recursive: true, mode: 0o700 });
+  if ((+req.headers['content-length'] || 0) > max) throw fail(413, 'That file is too large');
+  const tmp = file + '.part'; let n = 0;
+  req.on('data', c => { n += c.length; if (n > max) req.destroy(fail(413, 'That file is too large')); });
+  try { await pipeline(req, fs.createWriteStream(tmp, { mode: 0o600 })); } catch (e) { fs.rm(tmp, { force: true }, () => {}); throw e.code === 413 ? e : fail(e.code === 413 ? 413 : 400, e.message || 'The upload did not finish'); }
+  fs.renameSync(tmp, file); return n;
+}
+
+// ---- copying a file from the admin's Seafile (the Seafile sign-in the hub already holds for them)
+async function fromSeafile(repo, p) {
+  const token = settings.get('sf_token'); if (!token) throw fail(401, 'Open Files and sign in first, then try again');
+  if (!/^[\w-]{8,64}$/.test(repo) || !p || !p.startsWith('/') || p.split('/').includes('..')) throw fail(400, 'Choose a file');
+  const call = async url => fetch(url, { headers: { Authorization: 'Token ' + token }, signal: AbortSignal.timeout(30000) });
+  const lr = await call(`${SEAFILE()}/api2/repos/${repo}/file/?p=${encodeURIComponent(p)}&reuse=1`);
+  if (lr.status === 401) throw fail(401, 'Your Files sign-in has expired. Open Files and sign in again.'); if (!lr.ok) throw fail(lr.status === 404 ? 404 : 502, lr.status === 404 ? 'That file was not found in Files' : 'Files answered ' + lr.status);
+  const link = new URL(JSON.parse(await lr.text()), SEAFILE());
+  const r = await fetch(link, { signal: AbortSignal.timeout(30 * 60e3) }); if (!r.ok || !r.body) throw fail(502, 'Files would not send that file (' + r.status + ')');
+  if ((+r.headers.get('content-length') || 0) > MAX_FILE) throw fail(413, 'That file is too large');
+  return { stream: require('stream').Readable.fromWeb(r.body), name: safeName(p.split('/').pop()) };
+}
+
+// ---- extensions: one self-contained HTML file, run in a sandboxed frame with this Content-Security-Policy (no hub cookies, no hub address, no other frames)
+const EXT_CSP = "sandbox allow-scripts allow-forms allow-popups allow-modals; default-src 'none'; script-src 'unsafe-inline'; style-src 'unsafe-inline'; img-src data: blob: https:; media-src data: blob: https:; font-src data: https:; connect-src https:; base-uri 'none'; form-action 'none'; frame-ancestors 'self'";
+const EXT_META = '<meta http-equiv="Content-Security-Policy" content="' + EXT_CSP.replace(/^sandbox [^;]*; /, '').replace(/; frame-ancestors 'self'$/, '') + '">'; // (the same rules, for when the page is shown from the hub's own copy of it)
+const BRIDGE = EXT_META + `<script>(function(){var n=0,w={};window.addEventListener('message',function(e){var m=e.data;if(m&&m.hub&&w[m.id]){var f=w[m.id];delete w[m.id];m.error?f[1](new Error(m.error)):f[0](m.result)}});
+function call(method,args){return new Promise(function(ok,no){var id=++n;w[id]=[ok,no];parent.postMessage({hub:1,id:id,method:method,args:args||[]},'*')})}
+window.hub={storage:{get:function(k){return call('storage.get',[k])},set:function(k,v){return call('storage.set',[k,v])},all:function(){return call('storage.all')},remove:function(k){return call('storage.remove',[k])}},toast:function(t){return call('toast',[String(t)])},user:function(){return call('user')},open:function(u){return call('open',[String(u)])}}})()</script>`;
+const withBridge = html => /<head[^>]*>/i.test(html) ? html.replace(/<head[^>]*>/i, m => m + BRIDGE) : BRIDGE + html;
+
+async function handle(req, res) {
+  const u = new URL(req.url, 'http://x'), p = u.pathname.slice('/api/store/my'.length) || '/', me = users.current();
+  try {
+    let m;
+    if (p === '/items' && req.method === 'GET') return json(res, 200, { items: loadItems().sort((a, b) => b.added - a.added).map(view), installed: stateOf().installed, admin: !!me && me.role === 'admin' });
+    if (p === '/items' && req.method === 'POST') { // add or change an item's details (admin)
+      needAdmin(me); const b = JSON.parse(await readBody(req, 1e5) || '{}'), l = loadItems(), old = b.id ? l.find(x => x.id === b.id) : null;
+      if (b.id && !old) throw fail(404, 'Item not found'); if (!old && !KINDS.includes(b.kind)) throw fail(400, 'Choose what kind of thing this is');
+      const title = str(b.title, 120); if (!title) throw fail(400, 'Give it a title');
+      const url = str(b.url, 300); if (url && !/^https?:\/\/\S+$/i.test(url)) throw fail(400, 'The link must start with http');
+      const it = old || { id: newId(), kind: b.kind, files: [], cover: false, added: Date.now() };
+      Object.assign(it, { title, creator: str(b.creator, 120), description: str(b.description, 2000), version: str(b.version, 30), url, updated: Date.now() });
+      if (it.kind === 'extension') it.icon = str(b.icon, 4);
+      if (!old) { if (l.length >= 2000) throw fail(400, 'That is plenty of items'); l.push(it); } saveItems(l); return json(res, 200, view(it));
+    }
+    if ((m = /^\/items\/([0-9a-f]{12})$/.exec(p)) && req.method === 'DELETE') {
+      needAdmin(me); const l = loadItems(), it = l.find(x => x.id === m[1]); if (!it) throw fail(404, 'Item not found');
+      for (const f of it.files) fs.rmSync(fileOn(it, f.id), { force: true }); fs.rmSync(coverOn(it), { force: true }); saveItems(l.filter(x => x !== it)); return json(res, 200, { ok: true });
+    }
+    if ((m = /^\/items\/([0-9a-f]{12})\/files$/.exec(p)) && req.method === 'POST') { // upload one file (the body is the file; its name is in ?name=) or copy one from Seafile (JSON { repo, path })
+      needAdmin(me); const l = loadItems(), it = l.find(x => x.id === m[1]); if (!it) throw fail(404, 'Item not found');
+      if (it.files.length >= MAX_FILES_PER_ITEM) throw fail(400, 'That is plenty of files for one item');
+      if (it.kind !== 'music' && it.kind !== 'app' && it.files.length >= 1) throw fail(400, 'This kind of item holds one file. Remove the old one first.');
+      const fid = newId(); let name, size;
+      if (/json/.test(req.headers['content-type'] || '')) { const b = JSON.parse(await readBody(req, 1e4) || '{}'), src = await fromSeafile(String(b.repo || ''), String(b.path || '')); name = src.name; const tmp = fileOn(it, fid) + '.part'; fs.mkdirSync(FILES(), { recursive: true, mode: 0o700 }); let n = 0; src.stream.on('data', c => { n += c.length; if (n > MAX_FILE) src.stream.destroy(fail(413, 'That file is too large')); }); await pipeline(src.stream, fs.createWriteStream(tmp, { mode: 0o600 })).catch(e => { fs.rm(tmp, { force: true }, () => {}); throw e.code ? e : fail(502, 'The copy did not finish'); }); fs.renameSync(tmp, fileOn(it, fid)); size = n; }
+      else { name = safeName(u.searchParams.get('name')); size = await receive(req, fileOn(it, fid), it.kind === 'extension' ? MAX_EXT : MAX_FILE); }
+      const ext = extOf(name);
+      const bad = it.kind === 'book' && !BOOK_EXT.includes(ext) ? 'A book must be an EPUB, PDF, MOBI, AZW3 or DOCX file' : it.kind === 'music' && !/^(mp3|m4a|aac|flac|ogg|opus|wav)$/.test(ext) ? 'Music must be an MP3, M4A, AAC, FLAC, OGG, OPUS or WAV file' : it.kind === 'extension' && ext !== 'html' ? 'An extension is one .html file' : '';
+      if (bad) { fs.rm(fileOn(it, fid), { force: true }, () => {}); throw fail(400, bad); }
+      it.files.push({ id: fid, name, size, ext }); it.updated = Date.now(); saveItems(l); return json(res, 200, view(it));
+    }
+    if ((m = /^\/items\/([0-9a-f]{12})\/files\/([0-9a-f]{12})$/.exec(p))) {
+      const l = loadItems(), it = l.find(x => x.id === m[1]), f = it && it.files.find(x => x.id === m[2]); if (!f) throw fail(404, 'Not found');
+      if (req.method === 'DELETE') { needAdmin(me); fs.rmSync(fileOn(it, f.id), { force: true }); it.files = it.files.filter(x => x !== f); it.updated = Date.now(); saveItems(l); return json(res, 200, view(it)); }
+      if (req.method === 'GET') return send(req, res, fileOn(it, f.id), it.kind === 'extension' ? 'application/octet-stream' : TYPES[f.ext] || 'application/octet-stream', f.name, u.searchParams.get('dl') === '1' || !/^(audio|application\/pdf)/.test(TYPES[f.ext] || ''));
+    }
+    if ((m = /^\/items\/([0-9a-f]{12})\/cover$/.exec(p))) {
+      const l = loadItems(), it = l.find(x => x.id === m[1]); if (!it) throw fail(404, 'Not found');
+      if (req.method === 'POST') { // the picture is the body; its type must be a picture
+        needAdmin(me); const type = String(req.headers['content-type'] || '').split(';')[0].trim().toLowerCase(); if (!Object.values(IMAGE).includes(type)) throw fail(400, 'The cover must be a JPEG, PNG, GIF or WebP picture');
+        await receive(req, coverOn(it), MAX_COVER); it.cover = type; it.updated = Date.now(); saveItems(l); return json(res, 200, view(it));
+      }
+      if (req.method === 'DELETE') { needAdmin(me); fs.rm(coverOn(it), { force: true }, () => {}); it.cover = false; saveItems(l); return json(res, 200, view(it)); }
+      if (req.method === 'GET') { if (!it.cover) throw fail(404, 'No cover'); return send(req, res, coverOn(it), it.cover, 'cover', false); }
+    }
+    if ((m = /^\/items\/([0-9a-f]{12})\/to-library$/.exec(p)) && req.method === 'POST') { // a book goes onto the person's own shelf
+      if (!users.can(me, 'read')) throw fail(403, 'You do not have the Books tab');
+      const it = loadItems().find(x => x.id === m[1]); if (!it || it.kind !== 'book' || !it.files[0]) throw fail(404, 'That is not a book');
+      const f = it.files[0], buf = fs.readFileSync(fileOn(it, f.id)); let cover; if (it.cover) { try { cover = { type: it.cover, data: fs.readFileSync(coverOn(it)) }; } catch {} }
+      try { return json(res, 200, books.addBook(buf, f.ext, { title: it.title, author: it.creator }, cover)); } catch (e) { throw fail(400, e.message); }
+    }
+    // ---- extensions
+    if ((m = /^\/ext\/([0-9a-f]{12})\/page$/.exec(p)) && req.method === 'GET') { // the page itself, framed by the hub
+      const it = loadItems().find(x => x.id === m[1]); if (!it || it.kind !== 'extension' || !it.files[0]) throw fail(404, 'Not found');
+      const html = withBridge(fs.readFileSync(fileOn(it, it.files[0].id), 'utf8'));
+      res.writeHead(200, { 'content-type': 'text/html; charset=utf-8', 'content-security-policy': EXT_CSP, 'cache-control': 'no-store', 'x-content-type-options': 'nosniff', 'referrer-policy': 'no-referrer' }); return res.end(html);
+    }
+    if ((m = /^\/ext\/([0-9a-f]{12})\/(install|uninstall)$/.exec(p)) && req.method === 'POST') {
+      const it = loadItems().find(x => x.id === m[1]); if (!it || it.kind !== 'extension') throw fail(404, 'Not found');
+      const s = stateOf(); s.installed = s.installed.filter(x => x !== it.id); if (m[2] === 'install') s.installed.push(it.id); if (m[2] === 'uninstall') delete s.data[it.id]; saveState(s); return json(res, 200, { installed: s.installed });
+    }
+    if ((m = /^\/ext\/([0-9a-f]{12})\/data$/.exec(p))) { // the extension's own saved settings for this person
+      const it = loadItems().find(x => x.id === m[1]); if (!it || it.kind !== 'extension') throw fail(404, 'Not found'); const s = stateOf();
+      if (req.method === 'GET') return json(res, 200, s.data[it.id] || {});
+      if (req.method === 'POST') { const b = JSON.parse(await readBody(req, MAX_STATE + 1000) || '{}'); if (!b || typeof b !== 'object' || Array.isArray(b)) throw fail(400, 'Bad data'); if (JSON.stringify(b).length > MAX_STATE) throw fail(413, 'That is more than an extension may keep (256 KB)'); s.data[it.id] = b; saveState(s); return json(res, 200, { ok: true }); }
+    }
+    return json(res, 404, { error: 'Not found' });
+  } catch (e) { if (res.headersSent) return res.destroy(); return json(res, e.code >= 400 && e.code < 600 ? e.code : e.status === 413 ? 413 : 400, { error: e instanceof SyntaxError ? 'Bad request' : e.message }); }
+}
+
+module.exports = { handle, loadItems, EXT_CSP };
diff --git a/package.json b/package.json
index 38eaaa7..0a2bd4f 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
-    "test": "for t in smoke tasks push users cal plex player lyrics signal mail mail-imap files podcast abapi abdirect books store librivox radio vbv savefiles bible lrclib visualizer body transcript recipes contacts; do node tools/$t-test.js || exit 1; done",
+    "test": "for t in smoke tasks push users cal plex player lyrics signal mail mail-imap files podcast abapi abdirect books store librivox radio vbv savefiles bible lrclib visualizer body transcript recipes contacts mystore; do node tools/$t-test.js || exit 1; done",
     "audit": "npm audit --omit=dev --audit-level=high"
   },
   "keywords": [],
diff --git a/public/app.js b/public/app.js
index 5a7513a..b668673 100644
--- a/public/app.js
+++ b/public/app.js
@@ -93,6 +93,8 @@ const ICONS = {
   shuffle: '<path d="M3 7h3c4 0 5 10 9 10h6M3 17h3c1.5 0 2.5-1.5 3.5-3M15 7h6M18 4l3 3-3 3M18 14l3 3-3 3"/>',
   more: '<circle cx="5" cy="12" r="1.6" fill="currentColor"/><circle cx="12" cy="12" r="1.6" fill="currentColor"/><circle cx="19" cy="12" r="1.6" fill="currentColor"/>',
   cal: '<rect x="3" y="5" width="18" height="16" rx="2"/><path d="M3 10h18M8 3v4M16 3v4"/>',
+  store: '<path d="M4 9l1.5-5h13L20 9M4 9v11h16V9M4 9c0 1.7 1.3 3 3 3s3-1.3 3-3c0 1.7 1.3 3 3 3s3-1.3 3-3 1.3 3 3 3"/><path d="M10 20v-5h4v5"/>',
+  download: '<path d="M12 4v11M7 11l5 5 5-5M5 20h14"/>',
   chef: '<path d="M7 14a4 4 0 11.8-7.9A4 4 0 0116 6.5 4 4 0 0117 14v6H7z"/><path d="M7 17h10"/>',
   people: '<circle cx="9" cy="8" r="3.5"/><path d="M2.5 20a6.5 6.5 0 0113 0M16 4.5a3.5 3.5 0 010 7M18 14a6 6 0 013.5 6"/>',
   search: '<circle cx="11" cy="11" r="7"/><path d="M20 20l-4-4"/>',
@@ -162,8 +164,8 @@ const fmtSize = b => b < 1024 ? b + ' B' : b < 1048576 ? (b / 1024).toFixed(0) +
 const fmtDate = s => new Date(s * 1000).toLocaleDateString(undefined, { month: 'short', day: 'numeric', year: 'numeric' });
 
 // ---- Navigation
-const TABS = [['home', 'Home'], ['files', 'Files'], ['music', 'Music'], ['video', 'Movies & TV'], ['mail', 'Mail'], ['contacts', 'Contacts'], ['signal', 'Signal'], ['tasks', 'Tasks'], ['recipes', 'Recipes'], ['calendar', 'Calendar'], ['search', 'Search'], ['links', 'Links'], ['office', 'Office'], ['audio', 'Audiobooks'], ['podcast', 'Podcast'], ['radio', 'Radio'], ['bible', 'Bible'], ['read', 'Books'], ['verse', 'Podcast Admin'], ['settings', 'Settings']];
-const TAB_ICON = { home: 'home', mail: 'mail', signal: 'chat', files: 'files', office: 'doc', audio: 'audio', verse: 'book', podcast: 'mic', radio: 'radio', bible: 'bible', recipes: 'chef', contacts: 'people', listen: 'audio', reading: 'book', read: 'book', music: 'music', video: 'film', settings: 'cog', calendar: 'cal', search: 'search', tasks: 'check', links: 'link', planner: 'cal' };
+const TABS = [['home', 'Home'], ['files', 'Files'], ['music', 'Music'], ['video', 'Movies & TV'], ['mail', 'Mail'], ['contacts', 'Contacts'], ['signal', 'Signal'], ['tasks', 'Tasks'], ['recipes', 'Recipes'], ['store', 'Store'], ['calendar', 'Calendar'], ['search', 'Search'], ['links', 'Links'], ['office', 'Office'], ['audio', 'Audiobooks'], ['podcast', 'Podcast'], ['radio', 'Radio'], ['bible', 'Bible'], ['read', 'Books'], ['verse', 'Podcast Admin'], ['settings', 'Settings']];
+const TAB_ICON = { home: 'home', mail: 'mail', signal: 'chat', files: 'files', office: 'doc', audio: 'audio', verse: 'book', podcast: 'mic', radio: 'radio', bible: 'bible', recipes: 'chef', contacts: 'people', store: 'store', listen: 'audio', reading: 'book', read: 'book', music: 'music', video: 'film', settings: 'cog', calendar: 'cal', search: 'search', tasks: 'check', links: 'link', planner: 'cal' };
 /** The menu entries this person sees: Calendar and Tasks share one "Planner" entry, and the listening and reading tabs share "Listen" and "Read" (each part still needs its own permission). */
 const leafOf = id => Object.keys(MERGED).find(k => MERGED[k][1].includes(id));
 const navTabs = () => { const out = [], done = new Set(); for (const t of TABS) { if (t[0] === 'verse' || !allowed(t[0])) continue; let id = t[0], label = t[1];
@@ -173,14 +175,14 @@ const navTabs = () => { const out = [], done = new Set(); for (const t of TABS)
 const leafTabs = () => TABS.filter(t => t[0] !== 'verse' && t[0] !== 'home' && allowed(t[0]));
 const tabLabel = id => (TABS.find(x => x[0] === id) || (MERGED[id] ? [0, MERGED[id][0]] : id === 'planner' ? [0, 'Planner'] : [0, '']))[1];
 /** Menu entries grouped by kind. Anything not listed lands in the last group so a new tab is never lost. */
-const NAV_GROUPS = [['', ['home', 'search']], ['Work', ['planner', 'files', 'office', 'links', 'recipes']], ['Communicate', ['mail', 'contacts', 'signal']], ['Media', ['listen', 'reading', 'video']], ['', ['settings']]];
+const NAV_GROUPS = [['', ['home', 'search']], ['Work', ['planner', 'files', 'office', 'links', 'recipes']], ['Communicate', ['mail', 'contacts', 'signal']], ['Media', ['listen', 'reading', 'video', 'store']], ['', ['settings']]];
 const navGroups = (tabs = navTabs()) => {
   const out = NAV_GROUPS.map(([label, ids]) => ({ label, tabs: ids.map(id => tabs.find(t => t[0] === id)).filter(Boolean) }));
   const known = new Set(NAV_GROUPS.flatMap(g => g[1])); out[out.length - 2].tabs.push(...tabs.filter(t => !known.has(t[0])));
   return out.filter(g => g.tabs.length);
 };
 const sg = { st: null, convs: [], cur: null, unread: 0, es: null, timers: [], reply: null, tray: [], names: {} }; // Signal state
-const TAB_COLOR = { home: '#3d6bf0', search: '#6b7280', planner: '#d9453a', tasks: '#d9453a', calendar: '#d9453a', files: '#2f9e6e', office: '#e0742b', links: '#0f9d9a', mail: '#4f7cff', signal: '#3a76f0', listen: '#8a5cf0', music: '#e5a00d', radio: '#7b4fd6', recipes: '#e0742b', contacts: '#5b8def', podcast: '#c2417a', audio: '#8a5cf0', video: '#c0392b', reading: '#2b8a5e', bible: '#8b5a2b', read: '#2b8a5e', settings: '#6a7280' };
+const TAB_COLOR = { home: '#3d6bf0', search: '#6b7280', planner: '#d9453a', tasks: '#d9453a', calendar: '#d9453a', files: '#2f9e6e', office: '#e0742b', links: '#0f9d9a', mail: '#4f7cff', signal: '#3a76f0', listen: '#8a5cf0', music: '#e5a00d', radio: '#7b4fd6', store: '#d9822b', recipes: '#e0742b', contacts: '#5b8def', podcast: '#c2417a', audio: '#8a5cf0', video: '#c0392b', reading: '#2b8a5e', bible: '#8b5a2b', read: '#2b8a5e', settings: '#6a7280' };
 // The phone's bottom bar shows up to five entries you choose (Edit bottom bar, in the Apps sheet), then "More".
 const DEFAULT_PINS = ['home', 'files', 'planner', 'listen', 'mail'];
 const navPins = () => { const have = new Set(navTabs().map(t => t[0])), saved = store.get('nav_pins'); const out = (Array.isArray(saved) && saved.length ? saved : DEFAULT_PINS).filter(id => have.has(id)).slice(0, 5); return out.length ? out : [...have].slice(0, 4); };
@@ -250,7 +252,7 @@ function drawSubnav(name) {
 const navIdOf = name => name === 'edit' ? 'files' : (name === 'tasks' || name === 'calendar') ? 'planner' : leafOf(name) || name;
 let curRoute = '';
 
-const routesOf = () => ({ video: viewVideo, planner: viewPlanner, home: viewHome, mail: viewMail, files: viewFiles, office: viewOffice, audio: args => args[0] === 'classic' ? viewAudio() : args[0] === 'free' ? viewFreeBooks() : viewBooks(args), verse: () => location.replace('#/links'), podcast: args => args[0] === 'vbv' ? viewVbv(args.slice(1)) : viewPodcast(args), radio: viewRadio, recipes: args => viewRecipes(args), contacts: args => viewContacts(args), bible: args => viewBible(args), listen: () => location.replace('#/' + lastSub('listen')), reading: () => location.replace('#/' + lastSub('reading')), read: args => viewReader(args), music: viewMusic, tasks: viewTasks, search: viewSearch, calendar: viewCalendar, signal: viewSignal, links: viewLinks, settings: viewSettings, edit: viewEdit });
+const routesOf = () => ({ video: viewVideo, planner: viewPlanner, home: viewHome, mail: viewMail, files: viewFiles, office: viewOffice, audio: args => args[0] === 'classic' ? viewAudio() : args[0] === 'free' ? (allowed('store') ? location.replace('#/store/audiobooks') : viewFreeBooks()) : viewBooks(args), verse: () => location.replace('#/links'), podcast: args => args[0] === 'vbv' ? viewVbv(args.slice(1)) : viewPodcast(args), radio: viewRadio, recipes: args => viewRecipes(args), store: args => viewStore(args), contacts: args => viewContacts(args), bible: args => viewBible(args), listen: () => location.replace('#/' + lastSub('listen')), reading: () => location.replace('#/' + lastSub('reading')), read: args => viewReader(args), music: viewMusic, tasks: viewTasks, search: viewSearch, calendar: viewCalendar, signal: viewSignal, links: viewLinks, settings: viewSettings, edit: viewEdit });
 let editor;
 // Menu on a tablet or computer: collapse it to icons (wide screens), or hide it completely. Remembered on this device.
 const navPref = () => { try { return JSON.parse(localStorage.getItem('nav_pref')) || {}; } catch { return {}; } };
@@ -318,6 +320,7 @@ function homeApps() {
     office: () => tile('#/office', '#e0742b', 'doc', 'Office', 'OnlyOffice'),
     audio: () => tile('#/audio', '#8a5cf0', 'audio', 'Audiobooks', 'Listen'),
     podcast: () => tile('#/podcast', '#c2417a', 'mic', 'Podcast', 'Podcasts'),
+    store: () => tile('#/store', '#d9822b', 'store', 'Store', 'Books, audiobooks, radio & more'),
     recipes: () => tile('#/recipes', '#e0742b', 'chef', 'Recipes', 'Mealie & shopping list'),
     contacts: () => tile('#/contacts', '#5b8def', 'people', 'Contacts', 'People & birthdays'),
     radio: () => tile('#/radio', '#7b4fd6', 'radio', 'Radio', 'The Journey FM & more'),
@@ -327,7 +330,7 @@ function homeApps() {
     mail: () => tile('#/mail', '#4f7cff', 'mail', 'Mail', mailUnread ? mailUnread + ' unread' : 'Outlook.com'),
   };
   T.bible = () => tile('#/bible', '#8b5a2b', 'bible', 'Bible', 'Berean Standard Bible');
-  const HOME_GROUPS = [['Work', ['planner', 'files', 'office', 'links', 'recipes']], ['Communicate', ['mail', 'contacts', 'signal']], ['Listen', ['music', 'radio', 'podcast', 'audio']], ['Read and watch', ['bible', 'read', 'video']]];
+  const HOME_GROUPS = [['Work', ['planner', 'files', 'office', 'links', 'recipes']], ['Communicate', ['mail', 'contacts', 'signal']], ['Listen', ['music', 'radio', 'podcast', 'audio']], ['Read and watch', ['bible', 'read', 'video', 'store']]];
   return HOME_GROUPS.map(([label, ids]) => [label, ids.filter(id => T[id] && allowed(id))]).filter(g => g[1].length).map(([label, ids]) => `<h2>${esc(label)}</h2><div class="grid">${ids.map(id => T[id]()).join('')}</div>`).join('');
 }
 
diff --git a/public/index.html b/public/index.html
index 742ea89..35513c9 100644
--- a/public/index.html
+++ b/public/index.html
@@ -76,6 +76,7 @@
 <script src="/audiobooks-view.js"></script>
 <script src="/librivox-view.js"></script>
 <script src="/radio-view.js"></script>
+<script src="/store-view.js"></script>
 <script src="/recipes-view.js"></script>
 <script src="/contacts-view.js"></script>
 <script src="/bible-view.js"></script>
diff --git a/public/librivox-view.js b/public/librivox-view.js
index 2e1fcd2..c7186ec 100644
--- a/public/librivox-view.js
+++ b/public/librivox-view.js
@@ -46,13 +46,13 @@ function lvPlay(b, at) {
   lvApi('/shelf', lvOpt('POST', { id: b.id })).catch(() => {}); // a book you start is kept on your shelf
 }
 
-async function viewFreeBooks() {
-  const v = $('#view'); v.innerHTML = '<div class="wrap"><h1>Free audiobooks</h1><p class="empty">Loading…</p></div>';
+async function viewFreeBooks(host) { // host: { el, hash } when shown inside the Store tab
+  const v = host ? host.el : $('#view'), here = () => location.hash.startsWith(host ? host.hash : '#/audio/free'); v.innerHTML = '<div class="wrap"><h1>Free audiobooks</h1><p class="empty">Loading…</p></div>';
   try { lvShelf = await lvApi('/shelf'); await lvLoadProg(); } catch (e) { v.innerHTML = `<div class="wrap"><a class="btn ghost" href="#/audio">${icon('back')}Audiobooks</a><p class="err">${esc(e.message)}</p></div>`; return; }
-  if (!location.hash.startsWith('#/audio/free')) return;
+  if (!here()) return;
   const S = { q: '', page: 1, items: [], more: false, busy: false, seq: 0 };
   const card = b => lvCard(b);
-  v.innerHTML = `<div class="wrap"><div class="ptop"><a class="btn ghost" href="#/audio">${icon('back')}Audiobooks</a><h1 style="margin:0">Free audiobooks</h1></div>
+  v.innerHTML = `<div class="wrap">${host ? '' : `<div class="ptop"><a class="btn ghost" href="#/audio">${icon('back')}Audiobooks</a><h1 style="margin:0">Free audiobooks</h1></div>`}
     <p class="sub">Public-domain books read aloud by volunteers (LibriVox). Free, with no sign-in. A book you start is kept on your shelf.</p>
     <input type="search" id="lvq" placeholder="Search by title or author" autocomplete="off" autocapitalize="off" style="width:100%"><div id="lvnote"></div><div id="lvbody"></div><div id="lvmore" class="bar" style="justify-content:center"></div></div>`;
   const known = new Map(lvShelf.map(b => [b.id, b]));
diff --git a/public/music.js b/public/music.js
index 2d19c02..9dc817f 100644
--- a/public/music.js
+++ b/public/music.js
@@ -13,7 +13,7 @@ const px = {
     if (!r.ok) throw new Error('Plex error ' + r.status);
     return (await r.json()).MediaContainer || {};
   },
-  art: (thumb, w = 300) => thumb && /^\/api\/(podcast|ab|radio|vbv)\//.test(thumb) ? thumb : thumb ? `/plex/photo/:/transcode?width=${w}&height=${w}&minSize=1&upscale=1&url=${encodeURIComponent(thumb)}` : 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==',
+  art: (thumb, w = 300) => thumb && /^\/api\/(podcast|ab|radio|vbv|store)\//.test(thumb) ? thumb : thumb ? `/plex/photo/:/transcode?width=${w}&height=${w}&minSize=1&upscale=1&url=${encodeURIComponent(thumb)}` : 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==',
   // All music libraries on the server; the chosen one is remembered per server.
   async sections() {
     if (px.secs) return px.secs;
diff --git a/public/radio-view.js b/public/radio-view.js
index cf6bfaf..1913adf 100644
--- a/public/radio-view.js
+++ b/public/radio-view.js
@@ -38,17 +38,17 @@ function rdoApplyNow(t, n) {
 setInterval(rdoPoll, 10000); pl.a.addEventListener('playing', () => { if (rdoPlaying()) setTimeout(rdoPoll, 1500); });
 function rdoDrawNow(el, n) { el.innerHTML = n && n.title ? `<small>Now playing</small><b>${esc(n.title)}</b>${n.artist ? '<span> · ' + esc(n.artist) + '</span>' : ''}` : '<small>Live</small>'; }
 
-async function viewRadio() {
-  const v = $('#view'); v.innerHTML = '<div class="wrap"><h1>Radio</h1><p class="empty">Loading…</p></div>';
+async function viewRadio(host) { // host: { el, hash } when shown inside the Store tab
+  const v = host ? host.el : $('#view'), here = () => location.hash.startsWith(host ? host.hash : '#/radio'); v.innerHTML = '<div class="wrap"><h1>Radio</h1><p class="empty">Loading…</p></div>';
   let feat, mine;
   try { ({ featured: feat, mine } = await rdoApi('/stations')); } catch (e) { v.innerHTML = `<div class="wrap"><h1>Radio</h1><p class="err">${esc(e.message)}</p></div>`; return; }
-  if (!location.hash.startsWith('#/radio')) return;
+  if (!here()) return;
   rdoSaved = mine; const S = { q: '', tag: 'christian', items: [], more: false, busy: false, seq: 0, off: 0 };
   const saved = id => rdoSaved.some(x => x.id === id);
   const row = (s, fav) => `<div class="row rdorow${rdoPlaying() && rdoPlaying().key === 'radio:' + s.id ? ' playing' : ''}" data-id="${esc(s.id)}"><button class="rdoplay" data-play aria-label="Play ${esc(s.name)}"><span class="art">${s.favicon ? `<img alt="" loading="lazy" src="${esc(rdoIcon(s))}" onerror="this.remove()">` : ''}</span>
     <span class="grow"><b>${esc(s.name)}</b><small>${esc(rdoMeta(s))}</small></span>${icon('play')}</button>${s.featured ? '' : `<button class="ibtn" data-fav aria-label="${saved(s.id) ? 'Remove from my stations' : 'Save to my stations'}" title="${saved(s.id) ? 'Remove from my stations' : 'Save to my stations'}" style="${saved(s.id) ? 'color:var(--danger)' : ''}">${icon('heart')}</button>`}</div>`;
   const j = feat[0];
-  v.innerHTML = `<div class="wrap"><h1>Radio</h1>
+  v.innerHTML = `<div class="wrap">${host ? '' : '<h1>Radio</h1>'}
     <div class="card rdofeat" style="max-width:none"><div class="sub" style="margin:0">Featured</div><h2 style="margin:2px 0 0;font-size:22px;text-transform:none;letter-spacing:0;color:var(--text)">${esc(j.name)}</h2>
       <p class="sub" style="margin:2px 0 10px">${esc(rdoMeta(j))}</p><div id="rdonow" data-id="${esc(j.id)}" class="rdonow"><small>Live</small></div>
       <div class="bar"><button class="btn" id="rdojp">${icon('play')}Listen live</button><button class="btn ghost" id="rdojl">${icon('lyrics')}Lyrics</button><button class="btn ghost" id="rdojv">Visuals</button><a class="btn ghost" href="${esc(j.homepage)}" target="_blank" rel="noopener">${icon('ext')}Website</a><button class="btn ghost" id="rdojr">Recently played</button></div></div>
diff --git a/public/reader.js b/public/reader.js
index b6cdbbd..7ab1f28 100644
--- a/public/reader.js
+++ b/public/reader.js
@@ -27,7 +27,7 @@ const rdTitleOf = f => f.replace(/\.[^.]+$/, '').replace(/[_]+/g, ' ');
 // ======================================================= Library
 async function viewReader(args = []) {
   if (args[0] === 'open' && args[1]) return rdOpen(args[1]);
-  if (args[0] === 'store') return rdStore();
+  if (args[0] === 'store') return allowed('store') ? location.replace('#/store/books') : rdStore();
   const v = $('#view');
   v.innerHTML = '<div class="wrap"><h1>Books</h1><p class="empty">Loading…</p></div>';
   try { await rdLibrary(); } catch (e) {
@@ -151,14 +151,14 @@ async function rdMobiOpen(u8) {
 }
 
 // ======================================================= Book store: free, DRM-free books from Project Gutenberg, Standard Ebooks, the Internet Archive and any OPDS catalogue
-async function rdStore() {
-  const v = $('#view'); v.innerHTML = '<div class="wrap"><h1>Book store</h1><p class="empty">Loading…</p></div>';
+async function rdStore(host) { // host: { el, hash } when shown inside the Store tab
+  const v = host ? host.el : $('#view'), here = () => location.hash.startsWith(host ? host.hash : '#/read/store'); v.innerHTML = '<div class="wrap"><h1>Book store</h1><p class="empty">Loading…</p></div>';
   let sources, mine;
   try { [sources, mine] = await Promise.all([rdApi('/store/sources'), rdApi('/list')]); } catch (e) { v.innerHTML = `<div class="wrap"><a class="btn ghost" href="#/read">${icon('back')}Books</a><p class="err">${esc(e.message)}</p></div>`; return; }
-  if (!location.hash.startsWith('#/read/store')) return;
+  if (!here()) return;
   const key = b => (b.title + '|' + (b.author || '')).toLowerCase().replace(/\s+/g, ' ').trim(), have = new Map(mine.map(b => [key(b), b.id]));
   const S = { q: '', source: 'all', page: 1, items: [], more: false, seq: 0 };
-  v.innerHTML = `<div class="wrap" id="rdst"><div class="ptop"><a class="btn ghost" href="#/read">${icon('back')}Books</a><h1 style="margin:0">Book store</h1><span class="pspace grow"></span>${ME && ME.role === 'admin' ? `<button class="btn ghost" id="rdcat">${icon('cog')}Catalogues</button>` : ''}</div>
+  v.innerHTML = `<div class="wrap" id="rdst"><div class="ptop">${host ? '' : `<a class="btn ghost" href="#/read">${icon('back')}Books</a><h1 style="margin:0">Book store</h1>`}<span class="pspace grow"></span>${ME && ME.role === 'admin' ? `<button class="btn ghost" id="rdcat">${icon('cog')}Catalogues</button>` : ''}</div>
     <p class="sub">Free books without DRM, from public sources. Search them all at once, then add a book to your library in one tap.</p>
     <input type="search" id="rdsq" placeholder="Search titles and authors" autocomplete="off" autocapitalize="off" style="width:100%">
     <div class="seg" id="rdchips"></div><div id="rdnote"></div><div id="rdres"></div><div id="rdmore" class="bar" style="justify-content:center"></div></div>`;
diff --git a/public/store-view.js b/public/store-view.js
new file mode 100644
index 0000000..ac9204e
--- /dev/null
+++ b/public/store-view.js
@@ -0,0 +1,175 @@
+'use strict';
+// ---- Store: everything you can get, in one place. Books (free sources), free audiobooks, radio stations, and My Store: content the admin adds themselves (books,
+// music, apps to download, and extensions that add features to the hub). The first three are the same screens as before, shown inside this one.
+const stApi = (p, opts) => jfetch('/api/store/my' + p, opts);
+const stOpt = (m, o) => ({ method: m, headers: { 'content-type': 'application/json' }, body: o ? JSON.stringify(o) : undefined });
+const ST_KINDS = [['book', 'Books', 'book'], ['music', 'Music', 'music'], ['app', 'Apps', 'files'], ['extension', 'Extensions', 'cog']];
+const stKind = k => ST_KINDS.find(x => x[0] === k) || ST_KINDS[2];
+const stSize = b => fmtSize(+b || 0);
+const stCover = it => it.cover ? `/api/store/my/items/${it.id}/cover?v=${it.updated}` : '';
+const stHue = s => { let h = 0; for (const ch of String(s)) h = (h * 31 + ch.charCodeAt(0)) % 360; return h; };
+let stItems = [], stInstalled = [], stAdmin = false, stFilter = 'all';
+
+/** The sections this person may open (each needs its own tab's permission, except My Store). */
+const stSections = () => [['books', 'Books', allowed('read')], ['audiobooks', 'Audiobooks', allowed('audio')], ['radio', 'Radio', allowed('radio')], ['mine', 'My Store', true]].filter(s => s[2]);
+
+async function viewStore(args = []) {
+  const secs = stSections(), want = args[0] === 'ext' ? 'mine' : args[0], sec = (secs.find(s => s[0] === want) || secs[0])[0];
+  const v = $('#view');
+  v.innerHTML = `<div class="wrap" id="stwrap"><div class="ptop"><h1>Store</h1></div><div class="seg">${secs.map(s => `<a href="#/store/${s[0]}" class="${s[0] === sec ? 'on' : ''}">${esc(s[1])}</a>`).join('')}</div><div id="stbody"></div></div>`;
+  const el = $('#stbody'), host = { el, hash: '#/store/' + sec };
+  if (sec === 'books') return rdStore(host);
+  if (sec === 'audiobooks') return viewFreeBooks(host);
+  if (sec === 'radio') return viewRadio(host);
+  if (args[0] === 'ext' && args[1]) return stRunExt(el, args[1]);
+  return stMine(el);
+}
+
+// ---------------------------------------------------------------- My Store
+async function stLoad() { const r = await stApi('/items'); stItems = r.items; stInstalled = r.installed; stAdmin = r.admin; return r; }
+async function stMine(el) {
+  try { await stLoad(); } catch (e) { el.innerHTML = `<p class="err">${esc(e.message)}</p>`; return; }
+  const draw = () => {
+    if (!$('#stbody')) return;
+    const mine = stItems.filter(i => i.kind === 'extension' && stInstalled.includes(i.id)), shown = stItems.filter(i => stFilter === 'all' || i.kind === stFilter);
+    el.innerHTML = `<div class="bar" style="margin:0 0 8px;justify-content:flex-start"><p class="sub" style="margin:0;flex:1">Books, music, apps and extensions added just for this hub.</p>${stAdmin ? `<button class="btn" id="stadd">${icon('plus')}Add</button>` : ''}</div>
+      ${mine.length ? `<h2>My extensions</h2><div class="vgrid">${mine.map(i => stCard(i, true)).join('')}</div>` : ''}
+      <div class="seg" id="stkinds"><a href="#" data-k="all" class="${stFilter === 'all' ? 'on' : ''}">All</a>${ST_KINDS.map(k => `<a href="#" data-k="${k[0]}" class="${stFilter === k[0] ? 'on' : ''}">${k[1]}</a>`).join('')}</div>
+      ${shown.length ? `<div class="vgrid">${shown.map(i => stCard(i)).join('')}</div>` : `<p class="empty">${stItems.length ? 'Nothing of that kind yet.' : stAdmin ? 'Nothing here yet. Add your first book, album, app or extension.' : 'Nothing has been added yet.'}</p>`}`;
+    el.querySelectorAll('#stkinds a').forEach(a => a.onclick = e => { e.preventDefault(); stFilter = a.dataset.k; draw(); });
+    el.querySelectorAll('[data-it]').forEach(a => a.onclick = e => { e.preventDefault(); const it = stItems.find(x => x.id === a.dataset.it); if (a.dataset.run) location.hash = '#/store/ext/' + it.id; else stDetail(it, draw); });
+    if ($('#stadd')) $('#stadd').onclick = () => stEdit(null, draw);
+  };
+  draw();
+}
+const stCard = (it, run) => `<a class="vcard" href="#" data-it="${esc(it.id)}"${run ? ' data-run="1"' : ''}><span class="vimg" style="aspect-ratio:${it.kind === 'book' ? '2/3' : '1/1'};background:linear-gradient(135deg,hsl(${stHue(it.title)} 55% 40%),hsl(${stHue(it.title) + 40} 55% 28%));display:grid;place-items:center;color:#fff;font-size:40px">${it.cover ? `<img loading="lazy" alt="" src="${stCover(it)}" onerror="this.remove()">` : esc((it.kind === 'extension' && it.icon) || (it.title.match(/\p{L}|\p{N}/u) || ['?'])[0].toUpperCase())}</span>
+  <b>${esc(it.title)}</b><small>${esc([stKind(it.kind)[1].replace(/s$/, ''), it.creator].filter(Boolean).join(' · '))}</small></a>`;
+
+function stDetail(it, redraw) {
+  const k = it.kind, f0 = it.files[0], isMine = k === 'extension' && stInstalled.includes(it.id);
+  const url = f => `/api/store/my/items/${it.id}/files/${f.id}`;
+  const el = openSheet(it.title, [stKind(k)[1].replace(/s$/, ''), it.creator, it.version && 'v' + it.version].filter(Boolean).join(' · '), `<div style="display:flex;gap:14px;align-items:flex-start">${it.cover ? `<span class="vimg" style="width:96px;flex:none;aspect-ratio:${k === 'book' ? '2/3' : '1/1'}"><img alt="" src="${stCover(it)}"></span>` : ''}
+      <div style="min-width:0">${it.description ? `<p style="margin:0;white-space:normal">${esc(it.description).replace(/\n/g, '<br>')}</p>` : '<p class="sub" style="margin:0">No description.</p>'}</div></div>
+    ${k === 'music' || k === 'app' ? `<div class="list" style="margin-top:12px">${it.files.map((f, i) => `<div class="row"><span class="grow"><b>${esc(f.name)}</b><small>${esc(stSize(f.size))}</small></span>${k === 'music' ? `<button class="ibtn" data-play="${i}" aria-label="Play">${icon('play')}</button>` : ''}<a class="ibtn" href="${url(f)}?dl=1" download aria-label="Download">${icon('download')}</a></div>`).join('') || '<p class="empty">No files.</p>'}</div>` : ''}
+    <div class="err" id="sterr"></div><div class="bar" id="stbar" style="flex-wrap:wrap">
+      ${k === 'book' && f0 ? `${allowed('read') ? '<button class="btn" id="stlib">Add to my library</button>' : ''}<a class="btn ghost" href="${url(f0)}?dl=1" download>Download</a>` : ''}
+      ${k === 'music' && it.files.length ? `<button class="btn" id="stplay">${icon('play')}Play</button>` : ''}
+      ${k === 'app' && it.url ? `<a class="btn" href="${esc(it.url)}" target="_blank" rel="noopener noreferrer">Open link</a>` : ''}
+      ${k === 'extension' && f0 ? `<button class="btn" id="stinst">${isMine ? 'Open' : 'Install'}</button>${isMine ? '<button class="btn ghost" id="stun">Remove</button>' : ''}` : ''}
+      ${stAdmin ? '<button class="btn ghost" id="stedit">Edit</button>' : ''}</div>`);
+  const err = t => { el.querySelector('#sterr').textContent = t; };
+  const tracks = () => it.files.map(f => ({ key: `my:${it.id}:${f.id}`, title: f.name.replace(/\.[^.]+$/, '').replace(/^\d+[\s._-]+/, ''), artist: it.creator || '', album: it.title, thumb: stCover(it), src: url(f), nocache: true }));
+  const play = i => { playQueue(tracks(), i || 0); closeSheet(); };
+  if (el.querySelector('#stplay')) el.querySelector('#stplay').onclick = () => play(0);
+  el.querySelectorAll('[data-play]').forEach(b => b.onclick = () => play(+b.dataset.play));
+  if (el.querySelector('#stlib')) el.querySelector('#stlib').onclick = async e => { const b = e.currentTarget; b.disabled = true; try { const r = await stApi(`/items/${it.id}/to-library`, stOpt('POST')); closeSheet(); toast(r.duplicate ? 'Already in your library' : 'Added to your library', { label: 'Open', run: () => { location.hash = '#/read/open/' + r.id; } }); } catch (x) { err(x.message); b.disabled = false; } };
+  if (el.querySelector('#stinst')) el.querySelector('#stinst').onclick = async e => { const b = e.currentTarget; try { if (!isMine) { b.disabled = true; stInstalled = (await stApi(`/ext/${it.id}/install`, stOpt('POST'))).installed; } closeSheet(); location.hash = '#/store/ext/' + it.id; } catch (x) { err(x.message); b.disabled = false; } };
+  if (el.querySelector('#stun')) el.querySelector('#stun').onclick = () => { closeSheet(); confirmSheet('Remove this extension?', 'Its saved settings are forgotten too.', 'Remove', async () => { try { stInstalled = (await stApi(`/ext/${it.id}/uninstall`, stOpt('POST'))).installed; toast('Removed'); redraw(); } catch (x) { toast(x.message); } }); };
+  if (el.querySelector('#stedit')) el.querySelector('#stedit').onclick = () => { closeSheet(); stEdit(it, redraw); };
+}
+
+// ---- adding and changing (admin)
+function stEdit(it, redraw) {
+  const x = it || { kind: 'book', title: '', creator: '', description: '', version: '', url: '', icon: '', files: [], cover: false };
+  let created = false;
+  const el = openSheet(it ? 'Edit item' : 'Add to My Store', '', `<form id="stf">
+    ${it ? '' : `<label for="stk">What is it?</label><select id="stk">${ST_KINDS.map(k => `<option value="${k[0]}">${k[1].replace(/s$/, '')}</option>`).join('')}</select>`}
+    <label for="stt">Title</label><input type="text" id="stt" value="${esc(x.title)}" autocomplete="off" required>
+    <label for="stc" id="stcl">Author</label><input type="text" id="stc" value="${esc(x.creator)}" autocomplete="off">
+    <label for="std">Description</label><textarea id="std" rows="3">${esc(x.description)}</textarea>
+    <div id="stapp" hidden><label for="stv">Version</label><input type="text" id="stv" value="${esc(x.version)}" autocomplete="off"><label for="stu">Link (optional)</label><input type="url" id="stu" value="${esc(x.url)}" placeholder="https://…" autocapitalize="off"></div>
+    <div id="stext" hidden><label for="sti">Icon (one letter or emoji)</label><input type="text" id="sti" value="${esc(x.icon || '')}" maxlength="2" style="width:80px"></div>
+    <label>Files</label><div id="stfl" class="list"></div>
+    <div class="bar" style="justify-content:flex-start;margin:6px 0"><label class="btn ghost" style="cursor:pointer;margin:0">${icon('plus')}Upload<input type="file" id="stup" hidden multiple></label>${allowed('files') ? `<button type="button" class="btn ghost" id="stsf">${icon('files')}From Files</button>` : ''}</div>
+    <label>Cover picture</label><div class="bar" style="justify-content:flex-start;margin:4px 0"><label class="btn ghost" style="cursor:pointer;margin:0">${icon('plus')}Choose<input type="file" id="stcv" accept="image/jpeg,image/png,image/gif,image/webp" hidden></label><small id="stcvn" style="color:var(--muted)">${x.cover ? 'A cover is set' : ''}</small></div>
+    <div class="err" id="sterr"></div><div class="bar">${it ? '<button type="button" class="btn danger" id="stdel">Delete</button>' : ''}<button type="button" class="btn ghost" id="stx" style="flex:1;justify-content:center">Cancel</button><button class="btn" id="stok" style="flex:1;justify-content:center">${it ? 'Save' : 'Add'}</button></div></form>`);
+  const $e = s => el.querySelector(s), err = t => { $e('#sterr').textContent = t; };
+  let kind = x.kind; const files = [], existing = [...x.files]; let cover = null;
+  const kindUi = () => { kind = it ? x.kind : $e('#stk').value; $e('#stcl').textContent = kind === 'music' ? 'Artist' : kind === 'book' ? 'Author' : 'Made by'; $e('#stapp').hidden = kind !== 'app' && kind !== 'extension'; $e('#stext').hidden = kind !== 'extension';
+    $e('#stup').accept = kind === 'book' ? '.epub,.pdf,.mobi,.azw3,.azw,.docx' : kind === 'music' ? 'audio/*,.mp3,.m4a,.flac,.ogg,.opus,.wav' : kind === 'extension' ? '.html' : ''; $e('#stup').multiple = kind === 'music' || kind === 'app'; };
+  const drawFiles = () => { $e('#stfl').innerHTML = [...existing.map((f, i) => [f.name, stSize(f.size), 'e', i]), ...files.map((f, i) => [f.name || f.path.split('/').pop(), f.size != null ? stSize(f.size) : 'from Files', 'n', i])].map(([n, s, t, i]) => `<div class="row"><span class="grow"><b>${esc(n)}</b><small>${esc(s)}</small></span><button type="button" class="ibtn" data-t="${t}" data-i="${i}" aria-label="Remove">${icon('trash')}</button></div>`).join('') || '<p class="sub" style="margin:8px 12px">No files yet.</p>';
+    el.querySelectorAll('#stfl [data-t]').forEach(b => b.onclick = () => { (b.dataset.t === 'e' ? existing : files).splice(+b.dataset.i, 1); drawFiles(); }); };
+  if (!it) $e('#stk').onchange = kindUi; kindUi(); drawFiles();
+  $e('#stup').onchange = e => { const single = kind !== 'music' && kind !== 'app'; if (single) { files.length = 0; existing.length = 0; } for (const f of e.target.files) files.push(f); e.target.value = ''; drawFiles(); };
+  if ($e('#stsf')) $e('#stsf').onclick = async () => { const p = await stPickFile(); if (!p) return; if (kind !== 'music' && kind !== 'app') { files.length = 0; existing.length = 0; } files.push({ path: p.path, repo: p.repo, name: p.path.split('/').pop() }); drawFiles(); };
+  $e('#stcv').onchange = e => { cover = e.target.files[0] || null; $e('#stcvn').textContent = cover ? cover.name : ''; };
+  $e('#stx').onclick = closeSheet;
+  if ($e('#stdel')) $e('#stdel').onclick = () => { closeSheet(); confirmSheet('Delete this item?', it.title, 'Delete', async () => { try { await stApi('/items/' + it.id, { method: 'DELETE' }); toast('Deleted'); await stLoad(); redraw(); } catch (e) { toast(e.message); } }); };
+  $e('#stf').onsubmit = async e => {
+    e.preventDefault(); const ok = $e('#stok'); ok.disabled = true; err('');
+    try {
+      if (!files.length && !existing.length && kind !== 'app') throw new Error('Add the file first');
+      let saved = await stApi('/items', stOpt('POST', { id: it && it.id, kind, title: $e('#stt').value, creator: $e('#stc').value, description: $e('#std').value, version: $e('#stv').value, url: $e('#stu').value, icon: $e('#sti') ? $e('#sti').value : '' }));
+      if (!it) created = true;
+      for (const f of x.files) if (!existing.some(y => y.id === f.id)) saved = await stApi(`/items/${saved.id}/files/${f.id}`, { method: 'DELETE' });
+      let n = 0;
+      for (const f of files) {
+        ok.textContent = `Adding ${++n} of ${files.length}…`;
+        saved = f instanceof File ? await stApi(`/items/${saved.id}/files?name=${encodeURIComponent(f.name)}`, { method: 'POST', body: f, headers: { 'content-type': 'application/octet-stream' } }) : await stApi(`/items/${saved.id}/files`, stOpt('POST', { repo: f.repo, path: f.path }));
+      }
+      if (cover) saved = await stApi(`/items/${saved.id}/cover`, { method: 'POST', body: cover, headers: { 'content-type': cover.type } });
+      closeSheet(); toast(it ? 'Saved' : 'Added'); await stLoad(); redraw();
+    } catch (x2) { err(x2.message + (created ? ' The item was created without it: open it to finish.' : '')); ok.disabled = false; ok.textContent = it ? 'Save' : 'Add'; }
+  };
+}
+
+/** Pick one file from your Seafile libraries. Resolves { repo, path } or null. */
+function stPickFile() {
+  return new Promise(resolve => {
+    if (!sf.token()) { toast('Open Files and sign in first'); return resolve(null); }
+    let repo = null, dir = '/', done = false;
+    const el = openSheet('Choose a file from Files', '', '<div id="stpk"></div>'); const finish = v => { done = true; closeSheet(); resolve(v); };
+    el.querySelector('.scrim').addEventListener('click', () => { if (!done) resolve(null); });
+    const draw = async () => {
+      const box = el.querySelector('#stpk'); box.innerHTML = '<p class="empty">Loading…</p>';
+      try {
+        if (!repo) { const repos = (await sf.req('/api2/repos/')).filter(r => !r.encrypted).sort((a, b) => a.name.localeCompare(b.name));
+          box.innerHTML = `<div class="list" style="max-height:50dvh;overflow:auto">${repos.map(r => `<button class="row" data-r="${esc(r.id)}">${icon('files')}<span class="grow"><b>${esc(r.name)}</b></span></button>`).join('')}</div><div class="bar"><button class="btn ghost" id="pcx" style="flex:1;justify-content:center">Cancel</button></div>`;
+          box.querySelectorAll('[data-r]').forEach(b => b.onclick = () => { repo = b.dataset.r; dir = '/'; draw(); });
+        } else {
+          const items = (await sf.req(`/api2/repos/${encodeURIComponent(repo)}/dir/?p=${encodeURIComponent(dir)}`)).sort((a, b) => (a.type === b.type ? 0 : a.type === 'dir' ? -1 : 1) || a.name.localeCompare(b.name));
+          box.innerHTML = `<p class="sub" style="word-break:break-all">${esc(dir)}</p><div class="list" style="max-height:50dvh;overflow:auto"><button class="row" data-up="1">${icon('back')}<span class="grow"><b>${dir === '/' ? 'All libraries' : 'Up'}</b></span></button>
+            ${items.map(x => `<button class="row" data-${x.type === 'dir' ? 'd' : 'f'}="${esc(x.name)}">${icon(x.type === 'dir' ? 'files' : 'doc')}<span class="grow"><b>${esc(x.name)}</b>${x.type === 'dir' ? '' : `<small>${esc(stSize(x.size))}</small>`}</span></button>`).join('')}</div><div class="bar"><button class="btn ghost" id="pcx" style="flex:1;justify-content:center">Cancel</button></div>`;
+          box.querySelectorAll('[data-d]').forEach(b => b.onclick = () => { dir = (dir === '/' ? '' : dir) + '/' + b.dataset.d; draw(); });
+          box.querySelectorAll('[data-f]').forEach(b => b.onclick = () => finish({ repo, path: (dir === '/' ? '' : dir) + '/' + b.dataset.f }));
+          box.querySelector('[data-up]').onclick = () => { if (dir === '/') repo = null; else dir = dir.slice(0, dir.lastIndexOf('/')) || '/'; draw(); };
+        }
+        box.querySelector('#pcx').onclick = () => finish(null);
+      } catch (e) { box.innerHTML = `<p class="err">${esc(e.message)}</p>`; }
+    };
+    draw();
+  });
+}
+
+// ---------------------------------------------------------------- running an extension
+// The extension is one HTML file in a sandboxed frame (no access to your sign-in or the hub's data). It talks to the hub only through the messages below.
+async function stRunExt(el, id) {
+  try { await stLoad(); } catch (e) { el.innerHTML = `<p class="err">${esc(e.message)}</p>`; return; }
+  const it = stItems.find(x => x.id === id && x.kind === 'extension');
+  if (!it) { el.innerHTML = '<p class="empty">That extension is not in the store any more.</p>'; return; }
+  if (!stInstalled.includes(id)) { el.innerHTML = `<p class="empty">Install “${esc(it.title)}” from My Store first.</p>`; return; }
+  el.innerHTML = `<div class="bar" style="margin:0 0 8px;justify-content:flex-start"><a class="btn ghost" href="#/store/mine">${icon('back')}My Store</a><b style="flex:1">${esc(it.title)}</b></div>
+    <iframe id="stframe" title="${esc(it.title)}" sandbox="allow-scripts allow-forms allow-popups allow-modals" referrerpolicy="no-referrer" style="width:100%;height:calc(100dvh - 190px);min-height:360px;border:1px solid var(--line);border-radius:12px;background:#fff"></iframe>`;
+  const frame = el.querySelector('#stframe'); let data = null, timer;
+  // (the page is fetched by the hub and shown from here, so the frame needs no sign-in of its own; its sandbox keeps it from touching anything of the hub's)
+  fetch(`/api/store/my/ext/${id}/page`).then(r => r.ok ? r.text() : Promise.reject(new Error('Could not load it'))).then(h => { frame.srcdoc = h; }).catch(e => { el.querySelector('#stframe').outerHTML = `<p class="err">${esc(e.message)}</p>`; });
+  const load = async () => data || (data = await stApi(`/ext/${id}/data`).catch(() => ({})));
+  const save = () => { clearTimeout(timer); timer = setTimeout(() => stApi(`/ext/${id}/data`, stOpt('POST', data)).catch(e => toast(e.message)), 400); };
+  const onMsg = async e => {
+    if (!document.body.contains(frame)) return removeEventListener('message', onMsg);
+    if (e.source !== frame.contentWindow || !e.data || !e.data.hub) return;
+    const { id: mid, method, args = [] } = e.data; let result, error;
+    try {
+      if (method === 'storage.get') result = (await load())[String(args[0])] ?? null;
+      else if (method === 'storage.all') result = { ...(await load()) };
+      else if (method === 'storage.set') { const d = await load(); d[String(args[0]).slice(0, 100)] = args[1]; if (JSON.stringify(d).length > 256 * 1024) { delete d[String(args[0]).slice(0, 100)]; throw new Error('Out of space (256 KB)'); } save(); result = true; }
+      else if (method === 'storage.remove') { delete (await load())[String(args[0])]; save(); result = true; }
+      else if (method === 'toast') { toast(String(args[0]).slice(0, 200)); result = true; }
+      else if (method === 'user') result = { name: ME ? ME.name : '' };
+      else if (method === 'open') { if (/^https?:\/\//i.test(String(args[0]))) window.open(String(args[0]), '_blank', 'noopener,noreferrer'); result = true; }
+      else throw new Error('Unknown request');
+    } catch (x) { error = x.message; }
+    frame.contentWindow.postMessage({ hub: 1, id: mid, result, error }, '*');
+  };
+  addEventListener('message', onMsg);
+}
diff --git a/public/style.css b/public/style.css
index caf0cd2..76e5637 100644
--- a/public/style.css
+++ b/public/style.css
@@ -961,3 +961,7 @@ body.vizopen { overflow: hidden; }
 .ctsug { position: absolute; z-index: 30; left: 0; right: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 6px 20px rgba(0,0,0,.15); max-height: 220px; overflow: auto; }
 .ctsug button { display: block; width: 100%; text-align: left; padding: 8px 12px; border: 0; background: none; color: inherit; font: inherit; cursor: pointer; } .ctsug button:hover, .ctsug button.on { background: rgba(127,127,127,.15); }
 .pdhit { margin-bottom: 8px; } mark { background: rgba(255, 200, 0, .45); color: inherit; border-radius: 3px; }
+
+/* Store */
+#stbody .wrap { padding: 0; max-width: none; }
+#stbody .vimg img { width: 100%; height: 100%; object-fit: cover; }
diff --git a/public/sw.js b/public/sw.js
index 9821cd7..b449a91 100644
--- a/public/sw.js
+++ b/public/sw.js
@@ -1,5 +1,5 @@
 // App-shell cache only; Seafile/API traffic always goes to the network.
-const CACHE = 'hub-v51';
+const CACHE = 'hub-v52';
 const SHARE = 'hub-share'; // files shared into the app from other apps, held until the person picks a folder
 const SHELL = ['/icon.svg', '/manifest.webmanifest', '/icons/icon-192.png', '/icons/apple-touch-icon.png'];
 
diff --git a/server.js b/server.js
index 1b64272..8688977 100644
--- a/server.js
+++ b/server.js
@@ -43,6 +43,7 @@ const savefiles = require('./savefiles'); // "Save to Files": copy books, lesson
 const vbv = require('./vbv');         // Verse By Verse Ministry teaching (free Bible studies)
 const recipes = require('./recipes');     // recipes and the shopping list, from Mealie (MEALIE_URL, MEALIE_TOKEN)
 const contacts = require('./contacts');   // each person's address book (mail suggestions, calendar birthdays, vCard import and export)
+const mystore = require('./mystore');     // My Store: your own books, music, apps and extensions for everyone to use
 const radio = require('./radio');       // internet radio (Radio Browser directory, The Journey FM)
 const librivox = require('./librivox'); // free audiobooks from LibriVox
 const books = require('./books');      // e-book reader: EPUB, PDF and DOCX library with synced progress and notes
@@ -553,6 +554,7 @@ const ACCESS = [
   [/^\/api\/bible\//, ['bible']],
   [/^\/api\/read\//, ['read']],
   [/^\/api\/radio\//, ['radio']],
+  [/^\/api\/store\/my(\/|$)/, ['store']],
   [/^\/api\/recipes(\/|$)/, ['recipes']],
   [/^\/api\/contacts(\/|$)/, ['contacts']],
   [/^\/api\/signal\//, ['signal']],
@@ -650,6 +652,7 @@ async function handleRequest(req, res) {
     if (pathname.startsWith('/api/podcast/')) return podcast.handle(req, res);
     if (pathname.startsWith('/api/read/')) return books.handle(req, res);
     if (pathname.startsWith('/api/radio/')) return radio.handle(req, res);
+    if (pathname === '/api/store/my' || pathname.startsWith('/api/store/my/')) return mystore.handle(req, res);
     if (pathname === '/api/recipes' || pathname.startsWith('/api/recipes/')) return recipes.handle(req, res);
     if (pathname === '/api/contacts' || pathname.startsWith('/api/contacts/')) return contacts.handle(req, res);
     if (pathname.startsWith('/api/vbv/')) return vbv.handle(req, res);
diff --git a/tools/mystore-test.js b/tools/mystore-test.js
new file mode 100644
index 0000000..82f22fc
--- /dev/null
+++ b/tools/mystore-test.js
@@ -0,0 +1,55 @@
+// My Store: the admin adds items and files, everyone reads and downloads, books go onto a shelf, music streams with ranges, extensions are served sandboxed.
+const http = require('http'), assert = require('assert'), fs = require('fs'), os = require('os'), path = require('path'), cp = require('child_process');
+process.env.DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), 'nehub-ms-'));
+const fx = fs.mkdtempSync(path.join(os.tmpdir(), 'nehub-msfx-')); cp.execFileSync('python3', [path.join(__dirname, 'mkbooks.py'), fx]);
+const epub = fs.readFileSync(path.join(fx, 'test.epub')), gif = Buffer.from('R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==', 'base64');
+const users = require('../users'), books = require('../books'), ms = require('../mystore');
+const people = { a: users.create({ name: 'Ann', role: 'admin', handle: 'YQ' }), b: users.create({ name: 'Bob', role: 'user', tabs: ['store', 'read'], handle: 'Yg' }) };
+const hub = http.createServer((req, res) => users.runAs(req.headers['x-user'] === 'b' ? people.b : people.a, () => req.url.startsWith('/api/read/') ? books.handle(req, res) : ms.handle(req, res))).listen(0, async () => {
+  const base = 'http://127.0.0.1:' + hub.address().port, B = base + '/api/store/my', bob = { 'x-user': 'b' };
+  const post = (p, b, h = {}) => fetch(B + p, { method: 'POST', body: JSON.stringify(b), headers: { 'content-type': 'application/json', ...h } });
+  const put = (p, body, h = {}) => fetch(B + p, { method: 'POST', body, headers: h });
+  try {
+    assert.equal((await post('/items', { kind: 'book', title: 'X' }, bob)).status, 403, 'only the admin adds things');
+    assert.equal((await post('/items', { kind: 'nope', title: 'X' })).status, 400); assert.equal((await post('/items', { kind: 'book', title: ' ' })).status, 400);
+    // a book: one file, goes on the shelf
+    let book = await (await post('/items', { kind: 'book', title: 'My Own Book', creator: 'Me', description: 'Hello' })).json(); assert.match(book.id, /^[0-9a-f]{12}$/);
+    assert.equal((await put(`/items/${book.id}/files?name=x.exe`, epub, bob)).status, 403);
+    assert.equal((await put(`/items/${book.id}/files?name=x.exe`, epub)).status, 400, 'a book must be a book file');
+    book = await (await put(`/items/${book.id}/files?name=../../my%20book.epub`, epub)).json(); assert.equal(book.files[0].name, 'my book.epub', 'a name cannot reach other folders'); assert.equal(book.files[0].size, epub.length);
+    assert.equal((await put(`/items/${book.id}/files?name=two.epub`, epub)).status, 400, 'a book holds one file');
+    assert.equal((await put(`/items/${book.id}/cover`, 'not a picture', { 'content-type': 'text/html' })).status, 400); book = await (await put(`/items/${book.id}/cover`, gif, { 'content-type': 'image/gif' })).json(); assert.equal(book.cover, true);
+    let r = await fetch(`${B}/items/${book.id}/cover`, { headers: bob }); assert.equal(r.headers.get('content-type'), 'image/gif');
+    let list = await (await fetch(B + '/items', { headers: bob })).json(); assert.equal(list.items.length, 1); assert.equal(list.admin, false); assert.equal((await (await fetch(B + '/items')).json()).admin, true);
+    r = await fetch(`${base}/api/store/my/items/${book.id}/files/${book.files[0].id}`, { headers: bob }); assert.equal(r.status, 200); assert.match(r.headers.get('content-disposition'), /attachment/); assert.equal(Buffer.from(await r.arrayBuffer()).length, epub.length);
+    r = await fetch(`${B}/items/${book.id}/to-library`, { method: 'POST', headers: bob }); const sh = await r.json(); assert.equal(r.status, 200); assert.equal(sh.title, 'My Own Book'); assert.equal(sh.cover, true);
+    assert.equal((await (await fetch(base + '/api/read/list', { headers: bob })).json()).length, 1, 'it is on Bob\'s shelf, not Ann\'s'); assert.equal((await (await fetch(base + '/api/read/list')).json()).length, 0);
+    // music: several files, streamed with ranges
+    let alb = await (await post('/items', { kind: 'music', title: 'Album', creator: 'Band' })).json(); const mp3 = Buffer.from('0123456789abcdefghij');
+    alb = await (await put(`/items/${alb.id}/files?name=01.mp3`, mp3)).json(); alb = await (await put(`/items/${alb.id}/files?name=02.mp3`, mp3)).json(); assert.equal(alb.files.length, 2);
+    r = await fetch(`${B}/items/${alb.id}/files/${alb.files[0].id}`, { headers: { ...bob, range: 'bytes=2-5' } }); assert.equal(r.status, 206); assert.equal(await r.text(), '2345'); assert.equal(r.headers.get('content-range'), 'bytes 2-5/20'); assert.equal(r.headers.get('content-type'), 'audio/mpeg');
+    r = await fetch(`${B}/items/${alb.id}/files/${alb.files[0].id}`, { headers: { range: 'bytes=-4' } }); assert.equal(await r.text(), 'ghij'); assert.equal((await fetch(`${B}/items/${alb.id}/files/${alb.files[0].id}`, { headers: { range: 'bytes=50-60' } })).status, 416);
+    alb = await (await fetch(`${B}/items/${alb.id}/files/${alb.files[1].id}`, { method: 'DELETE' })).json(); assert.equal(alb.files.length, 1);
+    // an app: any file, plus a link
+    let app = await (await post('/items', { kind: 'app', title: 'Tool', version: '1.2', url: 'https://example.com/tool' })).json(); app = await (await put(`/items/${app.id}/files?name=tool.apk`, 'apk-bytes')).json(); assert.equal(app.version, '1.2');
+    assert.equal((await post('/items', { kind: 'app', title: 'Bad', url: 'javascript:alert(1)' })).status, 400);
+    // an extension: one html file, framed with a sandbox
+    let ext = await (await post('/items', { kind: 'extension', title: 'Counter', icon: '#' })).json(); assert.equal((await put(`/items/${ext.id}/files?name=a.js`, 'x')).status, 400);
+    ext = await (await put(`/items/${ext.id}/files?name=counter.html`, '<!doctype html><html><head><title>c</title></head><body>hi</body></html>')).json();
+    r = await fetch(`${B}/ext/${ext.id}/page`, { headers: bob }); const page = await r.text(); assert.match(r.headers.get('content-security-policy'), /^sandbox allow-scripts/); assert.match(r.headers.get('content-security-policy'), /default-src 'none'/); assert.ok(!/allow-same-origin/.test(r.headers.get('content-security-policy')), 'no same-origin: it cannot reach the hub');
+    assert.match(page, /window\.hub=/); assert.match(page, /<body>hi/);
+    assert.deepEqual((await (await post(`/ext/${ext.id}/install`, {}, bob)).json()).installed, [ext.id]); assert.deepEqual((await (await fetch(B + '/items')).json()).installed, [], 'installing is per person');
+    assert.equal((await post(`/ext/${ext.id}/data`, { n: 3 }, bob)).status, 200); assert.deepEqual(await (await fetch(`${B}/ext/${ext.id}/data`, { headers: bob })).json(), { n: 3 }); assert.deepEqual(await (await fetch(`${B}/ext/${ext.id}/data`)).json(), {});
+    assert.equal((await post(`/ext/${ext.id}/data`, { big: 'x'.repeat(300000) }, bob)).status, 413);
+    assert.deepEqual((await (await post(`/ext/${ext.id}/uninstall`, {}, bob)).json()).installed, []); assert.deepEqual(await (await fetch(`${B}/ext/${ext.id}/data`, { headers: bob })).json(), {}, 'uninstalling forgets its settings');
+    assert.equal((await fetch(`${B}/ext/${book.id}/page`)).status, 404, 'only extensions are framed');
+    // a Seafile copy needs a sign-in
+    r = await post(`/items/${alb.id}/files`, { repo: 'a'.repeat(36), path: '/x.mp3' }); assert.equal(r.status, 401);
+    // changing, deleting
+    book = await (await post('/items', { id: book.id, title: 'Renamed' })).json(); assert.equal(book.title, 'Renamed'); assert.equal(book.creator, '', 'details are replaced as a whole');
+    assert.equal((await fetch(`${B}/items/${alb.id}`, { method: 'DELETE', headers: bob })).status, 403); assert.equal((await fetch(`${B}/items/${alb.id}`, { method: 'DELETE' })).status, 200);
+    assert.equal(fs.readdirSync(path.join(process.env.DATA_DIR, 'mystore', 'files')).filter(f => f.startsWith(alb.id)).length, 0, 'its files are removed too');
+    console.log('mystore ok');
+  } catch (e) { console.error(e); process.exitCode = 1; }
+  hub.close(); setTimeout(() => process.exit(process.exitCode || 0), 50);
+});
diff --git a/users.js b/users.js
index f5907de..a109cb5 100644
--- a/users.js
+++ b/users.js
@@ -11,9 +11,9 @@ const USERS_DIR = path.join(DATA_DIR, 'users');
 fs.mkdirSync(DATA_DIR, { recursive: true });
 
 // Tabs an admin can switch on or off for a person. Home and Settings are always available to everyone (Settings only shows their own).
-const TABS = ['files', 'office', 'music', 'video', 'audio', 'podcast', 'radio', 'recipes', 'contacts', 'bible', 'read', 'verse', 'mail', 'signal', 'calendar', 'tasks', 'search', 'links'];
+const TABS = ['files', 'office', 'music', 'video', 'audio', 'podcast', 'radio', 'store', 'recipes', 'contacts', 'bible', 'read', 'verse', 'mail', 'signal', 'calendar', 'tasks', 'search', 'links'];
 const ALWAYS = ['home', 'settings'];
-const TAB_LABELS = { files: 'Files', office: 'Office', music: 'Music', video: 'Movies & TV', audio: 'Audiobooks', podcast: 'Podcast', radio: 'Radio', recipes: 'Recipes', contacts: 'Contacts', bible: 'Bible', read: 'Books', verse: 'Podcast Admin (in Links)', mail: 'Mail', signal: 'Signal', calendar: 'Calendar', tasks: 'Tasks', search: 'Search', links: 'Links' };
+const TAB_LABELS = { files: 'Files', office: 'Office', music: 'Music', video: 'Movies & TV', audio: 'Audiobooks', podcast: 'Podcast', radio: 'Radio', store: 'Store', recipes: 'Recipes', contacts: 'Contacts', bible: 'Bible', read: 'Books', verse: 'Podcast Admin (in Links)', mail: 'Mail', signal: 'Signal', calendar: 'Calendar', tasks: 'Tasks', search: 'Search', links: 'Links' };
 
 let cache = null;
 const load = () => { if (cache) return cache; try { cache = JSON.parse(fs.readFileSync(USERS_FILE, 'utf8')); } catch { cache = { users: [] }; } if (!Array.isArray(cache.users)) cache.users = []; return cache; };