400 Bad Request using FF @ MG

This just started some 15 min. ago and just for MGs, all other sites work just fine. This happened just after I posted a video and hit new posts and other navigation does not work here, gives same error, I also killed the tab and tried to get in that way. I ended the process in task man and restarted, same error. I am here now thanks to IE on the same rig and FF on my other machine is just fine.

Any ideas where to start besides blaming MA and his changing cookies?:-D Thanks as always folks.

 

Here's the whole error message:

Code:

400 Bad Request
Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.
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Meh, I should have cleared 'recent history' before wasting everyone's time, all is fine now.:-o Thanks Halo, you mentioning CCleaner got me to thinking.