Where does Firefox store favicons?

Some of the icons are incorrect or missing for the bookmarks. I have tried clearing the cache but that has no effect. I can't find them anywhere on the file system.

Answers:
If you are using XP go to,

%userprofile%/application data/mozilla

and browse the folder (ENter that into run).

if not, go to the documents folder, and look for the Application Data, and it will be in there. browse around, its in there