I second uBlock origin and Privacy Badger, as they have (to my knowledge) no commercial interests. As OP said, many other extensions/tools actually belong -thro

I second uBlock origin and Privacy Badger, as they have (to my knowledge) no commercial interests. As OP said, many other extensions/tools actually belong -through intermediaries- to data collection companies, so they might protect you from some threats but actually spy on you as well. Ghostery allows you to opt out of their data collection though, so it seems that the tool is at least partially trustworthy.