About:config in Firefox 3?

I've been messing with about:config, and somehow I got it to where whenever I click a link it doesn't do anything. I have to right click on it and open in a new tab, the open option isn't even there.

Answers:    Sort the fields by "Status" and on all the rows that are set to "user set" in which you think might have gotten messed up, right-click on the row and choose "Reset".
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