I installed Firefox 9 a few days ago and I’m loving it so far. In fact, it has replaced Chrome (which had replaced Firefox for me awhile back), which says a lot for the progress that Mozilla has made in the last couple of years.

Anyway, I was having this issue where resizing the Firefox window was really choppy and slow. Not a huge deal, but still annoying. The solution was to go into the Options, go to the Advanced tab, and uncheck “Use Hardware Acceleration”.