I noticed the same thing with Firefox version 0.9 on windows, it turned out that Firefox was using 100% cpu. I never did get to the bottom of it and the problem may not exist in 1.0 but check Firefox's cpu usage in an effort to try and narrow down the possibilities if <b>sashime76</b>'s advice doesnt fix it.
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If you always do what you've always done, you'll always get what you've always gotten
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