diff --git a/apps/desktop/extensions/ai-sidebar/background.js b/apps/desktop/extensions/ai-sidebar/background.js
index 745244b..8fbf47e 100644
--- a/apps/desktop/extensions/ai-sidebar/background.js
+++ b/apps/desktop/extensions/ai-sidebar/background.js
@@ -15,8 +15,79 @@ chrome.runtime.onInstalled.addListener(async () => {
   if (!aiConfig || !aiConfig.model) chrome.runtime.openOptionsPage();
 });
 
+// --- Extension store resolution (Tron store first, Chrome Web Store fallback) -
+// The install-helper content script runs on Chrome Web Store detail pages. Since
+// we do NOT publish on the Chrome Web Store, its "Add to TronBrowser" button must
+// prefer the TronBrowser store: given the extension's slug/name, check
+// tronbrowser.dev's store and, when a live listing exists, install from there;
+// otherwise the content script falls back to the Chrome Web Store CRX.
+//
+// We resolve here in the background (not the content script) because the SW has
+// host permissions for tronbrowser.dev, so the fetch isn't blocked by the store
+// page's CSP/CORS.
+const TRON_STORE_API = 'https://tronbrowser.dev/api/store';
+
+// A listing is installable only if it's live and has a downloadable artifact.
+function tronListingUsable(ext) {
+  return !!(ext && ext.status === 'live' && ext.version && (ext.version.crxUrl || ext.version.bundleUrl));
+}
+
+async function fetchTronListing(path) {
+  const ctrl = new AbortController();
+  const t = setTimeout(() => ctrl.abort(), 6000);
+  try {
+    const res = await fetch(`${TRON_STORE_API}${path}`, { signal: ctrl.signal });
+    if (!res.ok) return null;
+    return await res.json().catch(() => null);
+  } catch (_) {
+    return null;
+  } finally {
+    clearTimeout(t);
+  }
+}
+
+// Look the extension up in the TronBrowser store. The Chrome Web Store slug
+// usually matches the store slug for extensions we've republished; if it doesn't,
+// fall back to a name search and require an exact slug/name match (never install
+// an unrelated result). Returns the usable listing, or null.
+async function resolveTronStore(slug, name) {
+  if (slug) {
+    const ext = await fetchTronListing(`/extensions/${encodeURIComponent(slug)}`);
+    if (tronListingUsable(ext)) return ext;
+  }
+  const q = (name || slug || '').trim();
+  if (q) {
+    const data = await fetchTronListing(`/extensions?q=${encodeURIComponent(q)}`);
+    const list = (data && data.extensions) || [];
+    const nlc = (name || '').toLowerCase();
+    const hit =
+      (slug && list.find((e) => e.slug === slug)) ||
+      (nlc && list.find((e) => (e.name || '').toLowerCase() === nlc)) ||
+      null;
+    if (tronListingUsable(hit)) return hit;
+  }
+  return null;
+}
+
 // Let pages (e.g. the new tab) ask to open the side panel.
-chrome.runtime.onMessage.addListener((msg, sender) => {
+chrome.runtime.onMessage.addListener((msg, sender, sendResponse) => {
+  if (msg?.type === 'resolve-tron-store') {
+    (async () => {
+      const ext = await resolveTronStore(msg.slug, msg.name).catch(() => null);
+      if (ext) {
+        sendResponse({
+          found: true,
+          slug: ext.slug,
+          name: ext.name,
+          downloadUrl: `${TRON_STORE_API}/extensions/${encodeURIComponent(ext.slug)}/download`,
+        });
+      } else {
+        sendResponse({ found: false });
+      }
+    })();
+    return true; // async sendResponse
+  }
+
   if (msg?.type === 'open-sidepanel' && chrome.sidePanel?.open) {
     const opts = sender.tab?.id != null ? { tabId: sender.tab.id } : {};
     chrome.sidePanel.open(opts).catch((err) => console.warn('sidePanel open:', err));
diff --git a/apps/desktop/extensions/ai-sidebar/install-helper.js b/apps/desktop/extensions/ai-sidebar/install-helper.js
index 2f216f1..cca1f5b 100644
--- a/apps/desktop/extensions/ai-sidebar/install-helper.js
+++ b/apps/desktop/extensions/ai-sidebar/install-helper.js
@@ -1,4 +1,4 @@
-// Make Chrome Web Store installs work on Ungoogled Chromium.
+// Make extension installs work on Ungoogled Chromium.
 //
 // Google disables its native "Add to Chrome" button on non-official Chrome, so
 // it stays greyed out. We inject our own working button on extension detail
@@ -7,15 +7,28 @@
 // `extension-mime-request-handling = Always prompt for install` flag. If the
 // flag isn't active for some reason, the CRX simply downloads and can be
 // dragged onto chrome://extensions (Developer mode) instead.
+//
+// TronBrowser does NOT publish on the Chrome Web Store, so the button checks the
+// TronBrowser store FIRST (by the page's slug/name, resolved in the background
+// service worker which has host permissions). When a live TronBrowser-store
+// listing exists we install from there; only when it doesn't do we fall back to
+// the Chrome Web Store CRX.
 
 (function () {
   // Chrome extension IDs are 32 chars in a-p. New store URL:
   //   https://chromewebstore.google.com/detail/<slug>/<id>
-  const ID_RE = /\/detail\/(?:[^/]+\/)?([a-p]{32})/;
+  const DETAIL_RE = /\/detail\/(?:([^/]+)\/)?([a-p]{32})/;
+
+  function parseDetail() {
+    const m = location.pathname.match(DETAIL_RE);
+    if (!m) return null;
+    return { slug: m[1] || '', id: m[2] };
+  }
 
-  function extId() {
-    const m = location.pathname.match(ID_RE);
-    return m ? m[1] : '';
+  // The listing's human name, from the tab title ("uBlock Origin - Chrome Web
+  // Store"), used as a secondary lookup key when the slug doesn't match.
+  function extName() {
+    return (document.title || '').replace(/\s*[-–|]\s*Chrome Web Store\s*$/i, '').trim();
   }
 
   function chromeVersion() {
@@ -29,9 +42,31 @@
       '&x=' + encodeURIComponent('id=' + id + '&installsource=ondemand&uc');
   }
 
+  // Ask the background worker whether the TronBrowser store has this extension.
+  // Resolves to a Tron-store download URL, or null to use the Chrome CRX. Never
+  // rejects — any failure (SW asleep, offline, not listed) falls back to Chrome.
+  function resolveTronDownload(slug, name) {
+    return new Promise((resolve) => {
+      let settled = false;
+      const done = (v) => { if (!settled) { settled = true; resolve(v); } };
+      const timer = setTimeout(() => done(null), 5000); // never hang the click
+      try {
+        chrome.runtime.sendMessage({ type: 'resolve-tron-store', slug, name }, (resp) => {
+          clearTimeout(timer);
+          if (chrome.runtime.lastError || !resp || !resp.found || !resp.downloadUrl) { done(null); return; }
+          done(resp.downloadUrl);
+        });
+      } catch (_) {
+        clearTimeout(timer);
+        done(null);
+      }
+    });
+  }
+
   function addButton() {
-    const id = extId();
-    if (!id || document.getElementById('tron-install-btn')) return;
+    const detail = parseDetail();
+    if (!detail || document.getElementById('tron-install-btn')) return;
+    const { slug, id } = detail;
     const btn = document.createElement('button');
     btn.id = 'tron-install-btn';
     btn.type = 'button';
@@ -44,7 +79,22 @@
       'padding:12px 18px', 'font:700 14px ui-monospace,Menlo,monospace',
       'cursor:pointer', 'box-shadow:0 6px 24px rgba(0,0,0,.5)',
     ].join(';');
-    btn.addEventListener('click', () => { window.location.href = crxUrl(id); });
+
+    // Resolve the TronBrowser store up front so the button reflects where the
+    // install will come from; cache the promise so a click never re-resolves.
+    const tronTarget = resolveTronDownload(slug, extName());
+    tronTarget.then((url) => {
+      if (url) {
+        btn.textContent = '⬇ Add from TronBrowser Store';
+        btn.title = 'Install from the TronBrowser store (not published on the Chrome Web Store)';
+      }
+    });
+
+    btn.addEventListener('click', async () => {
+      // Tron store FIRST, Chrome Web Store CRX as the fallback.
+      const url = (await tronTarget) || crxUrl(id);
+      window.location.href = url;
+    });
     document.body.appendChild(btn);
   }