Easy SystemCleaner
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Temporary Internet Files in Firefox
In Firefox the "temporary internet files" is referred to as the "cache."
Here is how to view and find Firefox Temporary Files
You can clear the cache from within Firefox by going Tools->Clear Private Data, pressing ctrl + shift + delete, or going Tools->Options->Privacy->Cache. You can also delete it manually, or use Easy SystemCleaner to take care of it.
You can use Easy SystemCleaner to clean all Firefox traces.