Where is Firefox Portable's temp folder?

Does FFP use the user's default folder at

C:\Documents and Settings\*User*\Local Settings\Temporary Internet Files

or does it make use of a special folder? The reason I'm asking is because I sometimes find that my anti-virus picks up stuff that is left from sites I visited. When I clean these folders, it doesn't always seem to help.

I use FFP's built-in private data cleaner, as well as the Piriform CCleaner program.