The last time, when I dropped Firefox was when it started hogging GBs of memory (working set or VM I can't remember) after leaving it on for a few days.
Anyway, last time I checked, Chrome was still the most compliant with respect to HTML5. I've never checked Opera's score before though. And interestingly, when I did some site visits to my customers' offices, some of them still have internal pages that can't be read properly by anything other than IE =_=;
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