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Posted

To my knowledge, the only things that make Firefox consume a lot of CPU are animated gifs and large page loads (such as any thread of over a couple hundred replies on this forum when viewing them in hybrid or threaded mode). It can't be avoided, just ameliorated to an extent by upgrading one's CPU.

Memory usage can be tweaked, somewhat, in about:config under browser.cache.memory.capacity (and whether or not you want to enable memory caching via browser.cache.memory.enable). Otherwise, downgrade to a version before 2.0 as Firefox noticeably consumed much more memory at and after 2.0 than before.

Posted
To my knowledge, the only things that make Firefox consume a lot of CPU are animated gifs and large page loads

At times, embedded elements can cause high cpu usage as well. Be it java applets, flash, active x, etc.

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