Just in case you are curious as to what, technically, is going on here...
When FireFox imports the IE cookies it renames the "forums.gleemax.com" host name in the cookies to ".forums.gleemax.com" (note the extraneous "." prefix). I am not sure why FireFox is doing this (it should leave the host as-is during the import) but it may be doing this in an attempt to be RFC 2965 compliant for domain-match rules.
When you attempt to connect to
http://forums.gleemax.com using FireFox this triggers the endless redirect loop as the forums site attempts to log you back using the converted cookies containing the incorrect host name.
If you delete the cookies, specifically the "communityuserid" cookie, you will now be able to connect to the site again without it attempting to log you back in (and thus getting stuck in the endless redirect loop).
Once you log back in, FireFox will recreate the cookies with the correct host name and "all is well".