I have installed McAfee’s site advisor it shows as a plug in. But on web sites it is not showing the shields if they are safe or not also there is usually a search box you can have as well that is not there or showing the shield for going to their site .
Mcafee is about worthless from my test - way too many viruses and malware come right in, actually I can’t find any good browser protection utilities but use WOT without any issues. Only problem is WOT is just a warning system, that’s about it.