I stumbled across this recently and I’ve installed it on all the browsers I use. It’ll be interesting to see if it works.
https://tools.google.com/dlpage/gaoptout?hl=en
IMO it’s symptomatic of their arrogance that one has to install a bit of Google software to opt out of Google tracking you… In a sane World it would be an opt in, not an opt out decision for users.