fix: align Firefox minimum version with manifest capabilities

src/firefox/ARCHITECTURE.md

@@ -7,7 +7,7 @@
 Firefox uses Manifest V2 (background page, not service worker) and has **no access to the Chrome DevTools Protocol (CDP)**. Starting with v3.6.x, the Firefox build has been brought to functional parity with Chrome for the accessibility-tree (AX) subsystem — the same tree builder, the same four AX tools (`get_accessibility_tree`, `click_ax`, `type_ax`, `set_field`), and the same ref_id registry. What Firefox still lacks:
 
 - **No trusted events** — clicks and key presses are synthetic (`el.click()`, `new KeyboardEvent()`), and some sites reject `event.isTrusted === false`. All AX-tool click/type paths use synthetic dispatch in Firefox; the CDP-backed trusted-event path in Chrome has no Firefox equivalent.
-- **No pixel-perfect / full-page screenshots** — uses `browser.tabs.captureTab()` instead of CDP `Page.captureScreenshot`; it can capture the run tab while that tab is inactive. Firefox has exposed `tabs.captureTab()` since Firefox 59, before WebBrain's Firefox 109 minimum, and the manifest declares the required `<all_urls>` permission.
+- **No pixel-perfect / full-page screenshots** — uses `browser.tabs.captureTab()` instead of CDP `Page.captureScreenshot`; it can capture the run tab while that tab is inactive. Firefox has exposed `tabs.captureTab()` since Firefox 59, before WebBrain's current minimum, and the manifest declares the required `<all_urls>` permission.
 - **No shadow DOM piercing** — content script can read open shadow roots via `element.shadowRoot`, but cannot pierce closed roots.
 - **No offscreen document** — no HTTP fetch proxy for localhost LLM servers with Private Network Access / CORS issues. User must ensure their local LLM server sends permissive CORS headers.
 - **Some Chrome-only tools/features remain absent** — no CDP full-page screenshot, CDP upload automation, tab recording, offscreen fetch proxy, Chrome-only `shadow_dom_query`, or closed-shadow-root traversal.

src/firefox/manifest.json

@@ -103,7 +103,7 @@
   "browser_specific_settings": {
     "gecko": {
       "id": "webbrain@esokullu.com",
-      "strict_min_version": "109.0",
+      "strict_min_version": "140.0",
       "data_collection_permissions": {
         "required": ["none"],
         "optional": ["personallyIdentifyingInfo", "authenticationInfo", "personalCommunications", "websiteContent", "technicalAndInteraction"]

src/firefox/src/agent/agent.js

@@ -6989,7 +6989,7 @@ Rules: no prose intro, no conclusion, no "this screenshot shows...", no layout d
   /**
    * Capture a viewport screenshot for the run's tab without activating it.
    * `tabs.captureTab()` has been available since Firefox 59; WebBrain's
-   * minimum is Firefox 109 and its `<all_urls>` permission authorizes capture.
+   * current minimum is newer, and its `<all_urls>` permission authorizes capture.
    * Firefox supports `scale: 1` here to force a CSS-pixel-aligned image
    * (otherwise it captures at devicePixelRatio, causing the same coordinate-
    * mismatch loop Chrome had pre-1.5.1). Returns

test/run.js

@@ -13492,6 +13492,28 @@ test('firefox manifest declares required data collection permissions for AMO', (
   assert.deepEqual(manifest.browser_specific_settings?.gecko?.data_collection_permissions?.required, ['none']);
 });
 
+test('firefox minimum version covers declared manifest capabilities', () => {
+  const manifest = JSON.parse(fs.readFileSync(path.join(ROOT, 'src/firefox/manifest.json'), 'utf8'));
+  const declaredVersion = manifest.browser_specific_settings?.gecko?.strict_min_version;
+  const declaredVersionMatch = /^(\d+)(?:\.\d+)*$/.exec(declaredVersion);
+  const requirements = [];
+  if (manifest.permissions?.includes('tabGroups')) {
+    requirements.push({ feature: 'tabGroups permission', minimum: 139 });
+  }
+  if (manifest.browser_specific_settings?.gecko?.data_collection_permissions) {
+    requirements.push({ feature: 'data_collection_permissions', minimum: 140 });
+  }
+
+  assert.ok(declaredVersionMatch, 'Firefox strict_min_version must be a dotted numeric version');
+  const declaredMinimumMajor = Number(declaredVersionMatch[1]);
+  for (const requirement of requirements) {
+    assert.ok(
+      declaredMinimumMajor >= requirement.minimum,
+      `${requirement.feature} requires Firefox ${requirement.minimum}+, but strict_min_version is ${declaredVersion}`,
+    );
+  }
+});
+
 // ────────────────────────────────────────────────────────────────────────
 // Context-aware recommended actions
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