In the current version of the Mozilla Firefox web browser (version 126.96.36.199 at the time of this writing), the memory usage is a problem whenever you visit flash-intensive web sites. Mozilla themselves has admitted this. In the current beta version of Firefox 3 there is an add-on called RAMBack that supposedly cures (most of) the FF memory leak issues. I have not tested this as of yet but plan on doing so.
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