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A Google search says Webroot Spy Sweeper can cause this problem. Disabling Spy Sweeper's Tracking Cookies feature (or disabling Spy Sweeper altogether) can solve the issue.

 

How do I do this?
Hello sanderson55,

 

Welcome to the Webroot Community,

 

If you have a recent version of Webroot then you would not have Webroot SpySweeper. SpySweeper has not been around since 2012 I believe.Do you have Webroot  Version 9.0.10.21 (Released July 19th, 2016)

 

Please look here and see Mozilla Help concerning this error message. https://support.mozilla.org/en-US/kb/warning-unresponsive-script and try to trouble shoot. Also look here https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

 

 

Hope this helps?

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