Where is the temp folder of Mozilla Firefox in BT3? I have BT3 mounted to RAM

I've located /root/.mozilla/firefox/grc4ih40.default/Cache but it is only a Cache Folder.

In XP with Firefox or Opera, once you loaded Youtube for example, file temporary loaded to Cache then later move to Tmp folder once the video is completed loaded/downloaded.

So is there a temp folder in BT3 that holds these completed Video if I were to have visited the Youtube video for example?