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Since updating to 3.6.11 I can't open multiple browser windows. Windows 7 Pro

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Using Win 7 Pro I've always been able to open multiple Firefox browser windows. Since updating to Firefox 3.6.11 I can only open one window at a time. I can still have multiple windows open using Internet Explorer or Chrome.

Using Win 7 Pro I've always been able to open multiple Firefox browser windows. Since updating to Firefox 3.6.11 I can only open one window at a time. I can still have multiple windows open using Internet Explorer or Chrome.

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Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...