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Error message... End Script? "Script: chrome://searchshield/content/overlay.js:1650 How to fix?

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It happens +/- 10 times a day... 'puter slows... top banner says "(Not responding)" a few moments later an error message box appears reporting... "

It happens +/- 10 times a day... 'puter slows... top banner says "(Not responding)" a few moments later an error message box appears reporting... "

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Tools > Addons > Extensions
Disable the AVG Search Shield extension (or similar named AVG extension).