https://windowssecrets.com/newsletter/add-ons-that-help-browsers-block-web-trackers
That article discusses DoNotTrackMe, Ghostery, and Disconnect.
I use all 3 with Firefox. They each have advantages over the other two. Some may miss items the others find. Of course, none are 100%.
Eventually I had to remove Ghostery, completely uninstall Firefox, delete all vestiges of Firefox from the computer, and then reinstall it. The lagging finally quit but I'm fearful of putting Ghostery back on because of the same thing happening again.