I don't know...at one point I got off Firefox because it was slow and I was never able to get back to it ever again. Maybe I should try now?
It's not perfect, but it works, and unlike Chrome you can have full ad blocking with uBlock Origin.
Only truly independent browser engine left. Firefox is entirely independent on google, but unlike its competitors this dependency is through direct cash payments.
While I do not think that the gap narrowed when measured in CPU-cycles, it's just not very noticable when Firefox doesn't feel slow.
If (1) was all that mattered we would all be using the Preso engine version of Opera right now.