[ubuntu] Firefox Gets Slower / Less Responsive During Use

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http://ubuntuforums.org – Hello all, I have two completely different systems running Ubuntu 11.04. Firefox version is 10.0.2 When I first open Firefox for regular browsing, it is fast without any problems. However, after maybe an hour or so of use and opening/closing tabs here and there, Firefox gets slower. I'm surprised that I couldn't find another thread on this issue; some were similar but still off. First system runs an Intel CPU and Intel graphics card. Second system runs an AMD CPU and has an ATI graphics card. I am using the standard graphics driver on the computers - I'm not using the proprie (Hardware)