Firefox script error when browsing forums

snow

When browsing the forums with Firefox, I get the following error:

Something to the effect of: "A script on this page has become unresponsive."I can stop the script or continue letting it run. I have yet to find the details as to which script it is exactly.

Browser details:
Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1

This does not happen with IE. Has anyone else had this problem ?
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