I get a "JavaScript Application - Reference Error: XPCSafeJSObjectWrapper is not defined" error every time I try to open a new tab.

<blockquote>Locking duplicate thread. 
Please continue here: [/questions/777191]</blockquote> 
Just like the title says, starting with Firefox 4 Beta 6 or 7, I forgot. Any time I try to open a new blank tab (sometimes even when I start up Firefox and the app tabs load) I get an error that says "JavaScript Application - Reference Error: XPCSafeJSObjectWrapper is not defined" If I close it everything works as normal again (until I open a new tab) but it is very annoying to have to do this. Is there any fix for this or is the bug just still there?

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]

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I get a "JavaScript Application - Reference Error: XPCSafeJSObjectWrapper is not defined" error every time I try to open a new tab.

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