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When opened http bar shows this and closes immediately (i was able to read it only from screenshot) -> about:newaddon?id={4ED1F68A-5463-4931-9384-8FFF5ED91D92}

Posted

This error began after my refusal to install McAfee SiteAdvisor.

This error began after my refusal to install McAfee SiteAdvisor.

Modified by cor-el

Additional System Details

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; .NET4.0E; .NET4.0C; .NET CLR 3.5.30729; .NET CLR 2.0.50727; .NET CLR 3.0.30729; McAfee; rv:11.0) like Gecko

More Information

FredMcD
  • Top 10 Contributor
4308 solutions 60500 answers

What's your computer system and Firefox version?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options)
key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?

What's your computer system and Firefox version? Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift><br> ''(Mac=Options)'' ''' key, and then starting Firefox. A small dialog should appear. Click '''Start In Safe Mode''' (not Refresh). Is the problem still there?
cor-el
  • Top 10 Contributor
  • Moderator
17689 solutions 160037 answers

{4ED1F68A-5463-4931-9384-8FFF5ED91D92}: This is the GUID of the McAfee SiteAdvisor (WebAdvisor) extension.

McAfee likely installs this extension globally for Firefox and may insist on enabling this extension. If you do not want to use this extension in Firefox then best is to disable this in your McAfee security software.

Do you see this extension in about:addons? "3-bar" menu button or Tools -> Add-ons -> Extensions

You may also have to disable McAfee plugins.

{4ED1F68A-5463-4931-9384-8FFF5ED91D92}: This is the GUID of the McAfee SiteAdvisor (WebAdvisor) extension. McAfee likely installs this extension globally for Firefox and may insist on enabling this extension. If you do not want to use this extension in Firefox then best is to disable this in your McAfee security software. Do you see this extension in about:addons? "3-bar" menu button or Tools -> Add-ons -> Extensions You may also have to disable McAfee plugins. *https://support.mozilla.org/kb/Troubleshooting+plugins