Bugs have been reported in Firefox 4 and no doubt others will be found in then future. This is to be expected. All non-trivial software has bugs. As long as software is written by imperfect humans that isn't going to change.
I haven't found any issues with Firefox 4 either using Vista. Actually, since it's version 4, my comment about newer software tending to have more bugs probably wouldn't apply here. I also find it to be faster. Has anyone using Firefox 4 compared it to IE 9 ? I haven't installed IE 9 yet myself.
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