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by mws3d on April 25, 2007 · permalink

Window comes up with \"Incompatible Extension\" title.\r\nYellow exclamation, then \"Headers Toggle 0.5.2.2 could not be installed because it is not compatible with Firefox. \r\n\r\nI have Windows XP Pro, SP 2 \r\nFirefox 2.0.0.3\r\nThunderbird version 2.0.0.0 (20070326)