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A few days after updating Java to 6.0.21 in FF 3.6.8, anytime I would access http://www.wunderground.com/ , the page would not display correctly and I would get several pages of warning messages and errors in my Error Console.
One of the warnings was "window.addEvent is not a function" This was very misleading and lead me nowhere. Investigating, I finally noticed that in tools, add-ons, extensions there were 3 different Java Consoles. Deleting all but the most recent Java Console fixed the problem. It seems FF was having a problem deciding which console to use even though the Plugins indicated only the latest Java 6.0.21 was being used.