Silent Stopwatch Panel от Balqis

Silent Stopwatch Panel adds a minimal popup panel to the Firefox toolbar with a small stopwatch interface.

Users can start, pause, and reset the timer instantly.
The extension runs fully offline and does not request any browser permissions. It does not collect, store, or transmit user data, and it does not interact with websites or browsing activity.

All functionality is bundled locally inside the add-on package, making it lightweight, privacy-friendly, and easy to review.