Every browser pretty much presents webpages correctly according to modern CSS standards.
Every browser is fast enough that the difference is negligible
Not many people use any major add-on features of browsers, except like adblocker and stuff like that.
I really don't understand why this is an area that's worth competing in anymore, except providing an browser for your mobile ecosystem (chrome for android, spartan for windows phone, safari for apple, whatever). Webpages are still needed but apps are sweeping the field and providing better UX for the webpages that people use the most.
And downvote me as you might but firefox days are sadly counted