Firefox ain't going anywhere so they've lost a few users and having a few bumps in the road so what.
Firefox has been through this many times and have survived and will get through this and be around.
I'll keep using Firefox until Firefox is no longer if and when that ever happens.
Lets all panic about something that ain't happened yet and if for some reason Firefox does go away than I'll find another browser.
Firefox Rocks imo and I don't care what anyone else is using or says is better I like Firefox.