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The following error message came when I tried to open Firefox and install Firefox Home. "can't create mcafee plug-in object: TypeError: Components.classes[cid] is undefined"

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The following error message came when I tried to open Firefox and install Firefox Home.

"can't create mcafee plug-in object: TypeError: Components.classes[cid] is undefined"
The following error message came when I tried to open Firefox and install Firefox Home. "can't create mcafee plug-in object: TypeError: Components.classes[cid] is undefined"
cor-el
  • Top 10 Contributor
  • Moderator
17763 solutions 160635 answers

This issue can be caused by an extension or plugin that isn't working properly.

Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

  • Don't make any changes on the Safe mode start window.

See:

This issue can be caused by an extension or plugin that isn't working properly. Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). * Don't make any changes on the Safe mode start window. See: * [[Troubleshooting extensions and themes]] * [[Troubleshooting plugins]]
gilscape 0 solutions 2 answers

This error is caused (in my case) by the McAfee SiteAdvisor plug-in. I have recently sent in a support request and will post the results here in approx. 48 hours unless they respond sooner. In the meantime disable this add-on/plug-in and FF 4 will work fine. Also be careful when surfing the web without a link checker!

This error is caused (in my case) by the McAfee SiteAdvisor plug-in. I have recently sent in a support request and will post the results here in approx. 48 hours unless they respond sooner. In the meantime disable this add-on/plug-in and FF 4 will work fine. Also be careful when surfing the web without a link checker!