Nice to see FF doing the work and opening doors to so many extensions. The few things I have encountered on FF that are still a major PITA for me:
- Sometimes tabs gets corrupted in sense that they just wont load any data and show data of the tab that was shown previously. navigating to other domain and stuff wont work. (Encountered it in Private mode)
- Downloads may sometimes stop in middle.
- I feel the app consumes more battery
Mastodon is by the biggest contributor to Fediverse as a whole. Has been adopted by tons of Orgs like EU, W3C, Verge, Flipboard, etc.