Pour utiliser les extensions Android, vous aurez besoin de Firefox pour Android. Pour découvrir les modules complémentaires pour Firefox, veuillez visiter cette page.
regarding video: as far as i have been able to test: no, unfortunately not. I assume this is the main reason, why they do not support firefox. User agent faking applies only (!) to teams.microsoft.com. Please see the permission "Access your data for teams.microsoft.com" on the addon overview page.
