Must have been temporary, because the web site and the Firefox extension are both working fine. The plugin even works with Firefox 1.5 now...cool.
I could never get it to work, figured it was my 'puters security that prevented it. Doesn't matter, I use a yahoo account solely for this purpose (The amount of spam is INSANE) and I always tell them I am a 89 year old black woman with a PHD making 2M a year.