It does what it says. (And it's quite verbose about saying what it does.) I even checked its source code on GitLab. It is not as aggressive as it peers, so I installed it on my secondary web browser too.

Extirpated and blocked by Google (for Chrome), recommended by Mozilla. Tested the add-on, and who's right? Well ... not Google.

Danke an Google für die Werbung

Sehr gutes Addon. Danke @Google für die Werbung!

+1 got removed by google store for a bs reason and yet firefox recommends this extension, it must be good.

the Version 1.21.0 blocked the firefox sync. you can login but not pair your browser with extension url filtering enabled.

as much I like the addon, it should not break browser own features!