I am Having Trouble With Mozilla Firefox?

Question:A wee window pops up and says "ALERT - onLookupFailed 55 1" Whats That Mean ? It Has Something to do with JAVA but i dont know how to fix it ??

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ts caused by McAfee Site Advisor extension.
http://kb.mozillazine.org/problematic_ex...
This version is supposed to fix that:
http://www.siteadvisor.com/download/ff.h...

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