New transcript engine: the add-on now reads the caption track directly from the YouTube player and fetches the transcript silently — no transcript panel opens, no description needs expanding. Summaries now include the video description on every layout. Google retired gemini-2.5-flash (API returns 404); the default model is now gemini-3.5-flash and the model ID is configurable on the add-on settings page, so future retirements no longer require an update. If a model answers 503 "high demand", gemini-3.1-flash-lite is a working fallback. Groundwork for m.youtube.com support included.

Privacy
- Added telemetry opt-out checkbox in extension settings
- Anonymous usage statistics are enabled by default and can be disabled in the extension settings

UX
- API key field in the settings modal is now hidden once a valid key is stored — less clutter
- If the API key is rejected by Gemini (401/403), the key field reappears automatically with a warning
- Quota exceeded: button now shows a live countdown instead of just an error message

Compatibility
- Raised minimum Firefox version to 140 (required for data_collection_permissions)
- Raised minimum Firefox for Android version to 142

Internals
- Footer text now matches the chosen response language, not the UI language