If they don't kill VimFX and Tree Style Tabs, I might still stick around because the competition is pretty weak. FireFox without audio pretty much sucks though.
Mozilla needs to stop messing with the UI and removing functionality. From removing a lot of UI customization, to requiring extension signing, forcing PulseAudio on Linux and now removing the search bar. Congratulations Mozilla, it's Chrome.
I'm not sure who they're catering to anymore. People that like Chrome, but don't want to use it?
Edit: it looks very different than Chrome, but I feel like they're constantly copying (removing) functionality