McAfee Webadvisor
Mcafee Webadvisor does not appear in my Add-ons list but it is installed and appears in the Windows 10 Apps and Features list
Solução escolhida
I use McAfee Web advisor and I like it so I would prefer to stick with it but thanks for your help. I did manage to solve the problem a few minutes ago by uninstalling and reinstalling Firefox.
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I also use Kaspersky and you can get the add-on here...
Solução escolhida
I use McAfee Web advisor and I like it so I would prefer to stick with it but thanks for your help. I did manage to solve the problem a few minutes ago by uninstalling and reinstalling Firefox.