I have to say that as a user I personally believe that FireFox has lost and forgotten everything that made it attractive to begin with.
I no longer feel that Firefox is MY browser and it's a little saddening - most recently they enforce radical interface changes with not even a CHOICE to the user - based on OTHER browsers that I have obviously chosen NOT to use as I'm still using Firefox.
I may as well just USE chrome now - it's lighter anyway.
Everything that made Firefox DIFFERENT, and hence gave it value, is slowly evaporating away as it chameleons itself into the common swamp of samey-samey design - it's no longer unique...
... it's no longer attractive.