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What causes the following the below info. to happen?

Firefox
cor-el replied
Lou
Lou

the above message locks up my PC when it appears. If I click on stop script it releases the PC. The actual message is not always the same , but is always about script. Two different messages are pasted below

the above message locks up my PC when it appears. If I click on stop script it releases the PC. The actual message is not always the same , but is always about script. Two different messages are pasted below

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cor-el
cor-el
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This issue can be caused by an extension that isn't working properly.

Start Firefox in Use Troubleshoot Mode in Firefox to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).