Do you get a blank/white page or a 404 error page? I've moved the forum to a new hosting account, maybe the Firefox DNS settings are still pointing to the old server.
It's the DNS settings then. You can either try this:
1. Click the Microsoft Vista Start logo in the bottom left corner of the screen
2. Click All Programs
3. Click Accessories
4. RIGHT-click on Command Prompt
5. Select Run As Administrator
6. In the command window type the following and then hit enter: ipconfig /flushdns
7. You will see the following confirmation: Windows IP Configuration Successfully flushed the DNS Resolver Cache.
Did the flush now ie is doing the same thing...I will get into my router and change DNS servers in a while if it doesn't come back...am posting this from the phone ...runs fast on the phone