I doubt Firefox will ever take up as much memory as IE. You forget that most of IE doesn't appear in the list of...
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system processes. Lots of it is embedded in Windows, where it's hard to count. The tiny iexplore.exe "program" that starts IE is just a tugboat that's pulling a huge battleship.
Firefox does have a memory cache, though, and it can be big. That's for dial-up users who want to squeeze out every drop of performance. If you're on a corporate intranet you can turn that off. Type in this URL: "about:config" and search for "memory". Right click on a likely item, change it, and restart.
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