its good, but chrome shows error also vivaldi but not brave on downloading from https://github.com/cowlicks/privacypossum why?

It would be necessary to give a little more explanation !
A single phrase lapidary, it does not serve much !

Fortunately there is the GitHub repository, better provided in explanation.
I invite to read it :

https://github.com/cowlicks/privacypossum#current-features

It works and does what is written in its description.

ok