Never left Firefox, in part because I don't like Chrome's UI and in part because I don't want to make it easier than it already is for Google to track my every move.<p>That choice has become less painful in the last 3 months as Firefox's performance - especially memory usage and JavaScript execution speed - has begun to improve.<p>But I'm dreading the day they both finish dumbing down the UI and remove the ability to customize it properly. XUL extensions will be sadly missed. Mozilla needs to find an appropriate substitute - aside from privacy (which I can get from Safari too), thorough customization was Firefox's distinguishing feature.
Just tried Firefox Nightly (57.0a1) today, and...<i>wow</i>. I haven't seen such a speed boost since trying out Chrome 1.0, almost a decade ago. I probably won't <i>stop</i> using Chrome, but I'll certainly give FF another try, perhaps I'll even make it my primary browser again.