>>16
>> it's a shame it's not open source
Why, how often do you access the Firefox source code? FWIW, Firefox is also one of the worst examples of a project run "by the people", too, the majority of code changes and general direction of the project is limited to a few (~30?) at the top (some of whom are real asses like Asa). In practice, it does not appear that truly "open source" practices in the browser space get you any further than KHTML.
Fair enough if you prefer Firefox, but remember that Opera's UI only takes a bit of time to modify to your pleasing. For an app you spend much of your life in, I think that's very important and can make you very efficient, and that this advantage can make the initially kludgy UI more forgivable. I have countless weird little mouse gestures, UI changes, keyboard shortcuts, menu changes, per-site settings etc in Opera that I just couldn't cope without now.