Yup, I used it for a year or two, then I found Opera, which was about as fast and also had an independent rendering engine. Around that time, the independence of the rendering engine really mattered to me, so when Opera switched to a Chromium base, I switched back to Firefox. Firefox has since caught up in perf and is the best non-Chromium browser for me (well, I use Mull on Android because FF isn't on F-Droid and has some defaults I prefer to Fennec).