Great little tool on FirefoxForensics to do the same sort of thing as with IE. Firefox stores its cache of URLs etc in sqlite databases, which can be found in this folder:
C:\Documents and Settings\[username]\Application Data\Mozilla\Firefox\Profiles\[profilename]
For example there is a cookies.sqlite, formhistory.sqlite and downloads.sqlite for starters! I wish IE would be this neat!
I have updated my graph of internet usage to include Firefox. Almost afraid to admit how much I went on the internet during September! Firefox is in orange and IE in blue.
Lowmanio 