uMatrix for Firefox seems to be released as well: https://addons.mozilla.org/en-US/firefox/addon/umatrix/ https://addons.mozilla.org/en-US/firefox/addon/umatrix

uMatrix for Firefox seems to be released as well: https://addons.mozilla.org/en-US/firefox/addon/umatrix/ https://addons.mozilla.org/en-US/firefox/addon/umatrix/ Policeman was the closest thing —that I know of— to uMatrix for Firefox users, but —at least for me— Firefox is always complaining that Policeman is slowing down the browser. And also, it's nice that you can easily import your Chrome uMatrix rules to Firefox.