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When I click the "Add-Ons" button until tools, nothing happens and I get a popup

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The popup says:

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: file:///C:/Program%20Files%20(x86)/Mozilla%20Firefox/components/nsExtensionManager.js:623

This is very annoying, it keeps popping up until I shut up my computer. My add-ons have no effect either

The popup says: 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: file:///C:/Program%20Files%20(x86)/Mozilla%20Firefox/components/nsExtensionManager.js:623 This is very annoying, it keeps popping up until I shut up my computer. My add-ons have no effect either

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I found my solution here : http://support.mozilla.com/en-US/questions/749314

I had to uninstall personas 1.6 in safe-mode.

Now it's all-right.