That's odd, Julian.
Nothing has changed here in the time-frame since you've had this problem.
We have switched to a different server package to try to combat the ridiculous slowness that we have been experiencing lately, but that was basically a settings change on our hosts end-- increasing memory, cpu availability, bandwidth, etc.
Firefox did release version 3.6.13 back in December, but if the issue is more recent than that, we can rule it out.
I would try clicking Tools -> Options -> Privacy -> View Cookies. Type in americasdebate.com, and remove all the cookies from the site that you find.
If that doesn't work, check to make sure that there aren't any adblockers causing this, and possibly check if your virus scanner / internet security program is somehow modifying our pages.
And if all else fails, I can reset your password, and generate a new password salt and login key, which apparently can help some login issues.
Let me know how it goes.