You might notice that after you install Mozilla Thunderbird 60.x, spam email is identified as such by McAfee Anti-Spam, but you are no longer able to:

The reason is that the McAfee Anti-Spam toolbar isn’t displayed in Thunderbird because of the Anti-Spam plugin fails to load. This issue has been seen within the public unleash of Mozilla spirit 60.x, and within the beta unleash of Thunderbird 63.0

NOTE- Despite the fact that the plugin fails to load and the toolbar isn’t displayed, spam emails and phishing emails, are still recognized and noticed with a score.

When you open the Thunderbird 60.x Add-ons Manager >by clicking Tools, Add-ons, you will see that the McAfee Anti-Spam spirit Extension is installed. You can also download and install it from the official site mcafee.com/activate. The problem may occur because of activation. You have McAfee activate then you need a mcafee activate 25 digit code for the activation of your product.