The worst thing about Firefox updates is that... they didn't work for me. On my Debian box, I had to manually download and install each new version. That, and Firefox crashing several times a day without giving me a clue about what happened, what I could have done to fix the issue and the bug-report process always failing to submit reports, made me think that Firefox's days as a better browser had long passed. I'm a happy Opera user now. Opera's update system is integrated into Debian's.