okie doke, give this a shot:
1) Log out (might want to c&p these instructions into notepad or something)
2) go to Tools -> Options...
3) click on the "Cookies" tab
4) There should be a button that says "View Cookies" click it
5) Scroll down the list until you get to Mimitchi.com
6) There should be a couple of cookies that say something like PHPSESSID and SMFCookie10. Select each of these, and click the Remove Cookies button
7) Close all open windows/tabs in Firefox

Reload Firefox, and try coming back into TSS
Let me know if this helps^^