I just installed 4.0b7. When I open Firefox, I get a Javascript Application error message.

I just installed 4.0b7. When I open Firefox, a Javascript Application windows opens with the following message:
"what happened:TypeError: Components.classes ['@mozilla.org/extensions/manager;1'] is undefined".
The browser does open after I click 'OK' on the error message.
How can I fix this?
I have tried uninstaling and re-installing the browser.
I am using Windows 7.

That indicates an add-on is not compatible with 4.0b7. Follow the procedure in the [[troubleshooting extensions and themes]] article to identify the culprit. If you have the Ask toolbar either disable or uninstall it, that one is known to give this error and is not compatible with 4.0b7.

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