As with many other things in computers, those big players in the market
place are bad.
However I have been using McAfee for decades and never had any problems
It has done its job reliably. However I never use McAfee advisor in
Thunderbird. First Thunderbird is a email and newsgroup reader, and not
a web browser. (Yes it can browse the web, but Firefox is more efficient)
Since all you are opening are email and newsgroup messages, the McAfee
Advisor is not needed. This is assuming that you are allowing all
files to be scanned before they are opened, though I have read that all
incoming attachments to email do not need to be scanned. Only when opened.