> I just couldn't justify slower speeds and much poorer performance overall anymore... once Mozilla kills off XPCOM and XUL-based addons, there won't be any real reasons left to use Firefox.

Well now you don't have to, Firefox is now faster than Chrome by a huge margin with the 51.0.1 Electrolysis update.

Proof: https://www.dropbox.com/s/58doo8csebp9l62/Bench.pdf?dl=0