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Why am I getting thousands of warning messages reading"Warning: Unexpected token in attribute selector: '!'. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0""

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Once I open Firefox and go into Tools, Error Console, the following warning messages are generated continually Warning: Unexpected token in attribute selector: '!'. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0 Warning: Unexpected token in attribute selector: '!'. Dangling combinator. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0 Warning: Unexpected token in attribute selector: '!'. Dangling combinator. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0 Warning: Unexpected token in attribute selector: '!'. Dangling combinator. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0

Once I open Firefox and go into Tools, Error Console, the following warning messages are generated continually Warning: Unexpected token in attribute selector: '!'. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0 Warning: Unexpected token in attribute selector: '!'. Dangling combinator. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0 Warning: Unexpected token in attribute selector: '!'. Dangling combinator. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0 Warning: Unexpected token in attribute selector: '!'. Dangling combinator. Source File: http://www.google.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official Line: 0

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This is happening to me as well. Disabling the McAfee SiteAdvisor plug-in seemed to stop the behavior.