Bad script nsExtensionManager.js:623 locks up Firefox add-ons and plug-ins

I've started getting the message below any time I try to use add-ons or plug-ins such as Google toolbar and Yoono.
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/Mozilla%20Firefox/components/nsExtensionManager.js:623
Neither the "cancel" nor the "stop script" button will make the warning box go away. Nothing but a reboot will. And any time I try to go to Tools-Add-ins, or use any Add-ins, the box comes back and I'm locked up again.
Rebooting does not solve the problem, and oddly, reinstalling Firefox does not solve the problem. I also opened Firefox in SAFE mode, and I still get the exact same problem.

You're probably not exiting Firefox completely. Open the task manager and choose the Processes tab. Find the firefox.exe, select it and end process. If you have the Firefox Preloader installed, look for the FirefoxPreloader.exe and end that process as well. You'll know everything is closed when the error message stops reappearing. Hopefully this will enable you to open safe-mode. (;

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Bad script nsExtensionManager.js:623 locks up Firefox add-ons and plug-ins

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