I had the same problem: with the XBL binding for firefox. I am using windows XP, but I don't think it matters if you are using a windows based system. what is happening is the extensions you are using are incorrect. iIf you use the instructions on this site (use this link to get there), everything will be ok.
http://www.mozilla.org/products/firefox/releases/fix-extensions.html
Good luck I hope the best for you
Reuben Brown
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