Have you tried customizing the UI? Last time I tried out-of-the-box Firefox it disgusted me pretty quickly due to how Chrome-like it was, but that's because I never liked the default Chrome UI. In any case I bring up customization since while I've never left Firefox, their last good out-of-the-box UI was like Firefox 1.4 or maybe 2. Firefox is incredibly customizable though (even if less so now) and so it looks and feels how I prefer which no other browser duplicates out of the box (not even Firefox) and no other browser even makes possible. I guess I'm a "power user" for wanting to fit the tool to my hands rather than my hands to the tool, and Firefox is the only browser that spares a thought for me.