I expect 2 things from Firefox before I consider seriously switching:
1) Bring security sandboxing already.
2) Fix the terrible rendering on Android. Seriously, Firefox has literally the worst rendering out of all mobile browsers. And by worst, I mean slowest. I don't know whether it's some kind of on purpose delayed rendering, or if it's just that slow, but they need to change that. It's especially more obvious on lower-end phones (where Firefox OS is supposedly making a big push).
Also, after all this time, Opera Classic (not the new one) is still my preferred browser on Android. It acts the way it should when double tapping (makes the page big and usable). Chrome/new Opera don't really do anything when double tapped. And it has the fastest rendering.
It also still has a great mobile browser UI. I don't know what Opera did with the new one, but they totally killed that UI in it. Anyway, my point is, Firefox could learn a thing or two from Opera Classic for mobile.
Fix the terrible rendering on Android. Seriously, Firefox has literally the worst rendering out of all mobile browsers. And by worst, I mean slowest.
Firefox feels fast on the Nexus 5. I use it over Chrome, because I want to disable third-party cookies. Chrome on Android doesn't give me that option...
Same here on a Galaxy Note II. Pretty high-end phone though, that might have something to do with it. Still, been using Firefox ever since I got the phone (my first Android after years of Symbian) and I'm very happy with it. It even has about:config included!
1) Bring security sandboxing already.
2) Fix the terrible rendering on Android. Seriously, Firefox has literally the worst rendering out of all mobile browsers. And by worst, I mean slowest. I don't know whether it's some kind of on purpose delayed rendering, or if it's just that slow, but they need to change that. It's especially more obvious on lower-end phones (where Firefox OS is supposedly making a big push).
Also, after all this time, Opera Classic (not the new one) is still my preferred browser on Android. It acts the way it should when double tapping (makes the page big and usable). Chrome/new Opera don't really do anything when double tapped. And it has the fastest rendering.
It also still has a great mobile browser UI. I don't know what Opera did with the new one, but they totally killed that UI in it. Anyway, my point is, Firefox could learn a thing or two from Opera Classic for mobile.