Pour utiliser les extensions Android, vous aurez besoin de Firefox pour Android. Pour découvrir les modules complémentaires pour Firefox, veuillez visiter cette page.
The menu is there at startup, but it disappears from time to time. To make it appear again, you need to disable and then re-enable again the add-on. If this is what is happening to you, it seems Firefox bug https://bugzilla.mozilla.org/show_bug.cgi?id=832990 is not quite fixed yet...
