It'd be even less if there weren't various factors that FORCE people into using it. EG just for myself, software installation policies that pretty much ban having any other browser (except maybe loophole-skirting editions of chrome) unless you can sweet-talk the sysadmins into putting it on an image; or on an own-desk workstation, where FFx is the default, it getting hit by a group policy that bans facebook and youtube even during lunchhour.
So I end up having to use intershit explotrash. How can something get to version 8 (which, an obligate XP-a-naut, I'm limited to) and still have so much in the way of performance, security and memory issues?