JavaScript Application failure at startup

I'm running Windows Vista Home Premium. My PC has several user accounts on it. Using an Administrator account, I installed the Firefox 4 beta 4. Then I signed onto the account I usually use, created a shortcut to the new Firefox program, and copied it into my QuickLaunch bar. When I start the new beta version from anywhere, however, I first get an error message with the title bar "[JavaScript Application]" and the text "what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined". I click on the OK button, and it seems to work normally, but I would like to try a heavy JavaScript app to make sure. Anyone have any idea what's going on?

The only file I copied was the shortcut. However, I ran the Uninstall and re-installed from the original download. I still have the same problem. I'm beginning to think it might be due to a Java security setting. I recall something several months ago that advised people to turn off Java Scripting because of a security exposure. Perhaps this option was copied over to the new browser settings and is causing this error message at startup?
I also notice that the browser looks different running under my Admin account as opposed to any of the user accounts. In the Admin account, the title bar contains only the orange Firefox pull-down button, but in the user accounts, the Title bar has a web-site name plus "Mozilla Firefox 4.0 Beta 4", and the orange Firefox pull-down button is below that on a separate line.
P.S. I get the exact same error if I click on the orange Firefox button, select Options -> General -> Manage Add-Ons

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    ==
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