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To solve another problem, I need to reset my user agent. But when I type about:config in the address bar, all I get is a Firefox window that has the text "config" on the page and nothing else. No text or fields or ANYTHING. What can i do short of unins

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Firefox 3.6.3 Windows XP Otherwise browses OK.

User Agent

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

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It kinda cut you off in the title... I can help if you tell me the rest of it.

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Make sure that you type about:config in one word and without any spaces in the location bar.

You can also use "Reset all user preferences to Firefox defaults" on the Diagnose Firefox issues using Troubleshoot Mode start window - See http://kb.mozillazine.org/Resetting_preferences