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What operating system and what verison of Firefox?
If XP and Firefox 1.0x, it will be under c:\documents and settings\user signed on\application data\mozilla\firefox\profiles\whatever profile you are using\cache.
Other versions may be in other places, same holds true with operating systems. Best way to find it is search under explorer for "cache".
Yes i used the about:cache command in firefox. It keeps deleting all my cache! I even copy the old cache, paste it in the cache folder. But as soon as firefox opens up, it replaces everything with 0kb files. It's annoying as hell. But whatever.