Firefox tracking blocking is a fairly weak "make the web a bit safer while breaking nothing". This extensions actually does break stuff like google logins on non google websites.
I've thought for a minute when looking at that option, and couldn't think of why I wouldn't want it, so turned it on. IDK if it misses anything but seems to be working pretty good, judging by messages in the console.
It's rather aggressive, even: blocks Yandex's maps embedded on other sites (though iirc doesn't block Google's maps).
It does trip a lot of “turn off your ad blocker” nag screens.