firefox uses up a lot of ram

[jjshabado]

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Firefox does have memory leaks but this doesn't explain why his cpu usage is so high. Demon, I think you may have issues with your PC other than Firefox.

Please submit a HijackThis log if you're interested in diagnosing this problem. In your post include what type of processor you have, amount of RAM, how full your hard drive is, and how long it has been since you defragged.

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Good point, I misread the OP. I would occassionally go to one site with messed up javascript that use to spike my cpu usage. OP, can you track the problem to after you open a certain page?