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Everytime I try to open firefox browser, a window opens after a while that states: see details

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A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: chrome://tavgp/content/libs/include.js:595. What can I do to stop this?


I also cannot open another browser with Ctrl&N

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: chrome://tavgp/content/libs/include.js:595. What can I do to stop this? I also cannot open another browser with Ctrl&N

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Disable the AVG extension you have installed. If you don't have an extension installed with AVG in the name, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes