Great idea for an add on, but unfortunately it's broken for use with google because of problems with domain-specific blocking. There have been tickets open since mid-2018, but there doesn't seem to be any interest or progress in fixing them.
PS - Sorry if my review seems harsh, but given how dominant Google is (and given how aggressive they are with tracking) shouldn't the information page mention that it doesn't work with Google? Just seems like a prudent thing to do to help people with basic "surfing safety." Don't get me wrong, I appreciate your efforts on the tool, and it looks like it could be very handy, but I was pretty unhappy when I thought it was performing an important privacy protection function it wasn't.