There’s a “save” button you have to click to persist your changes after you’ve toggled the green/red cells of the media-types-per-domain table to suit what you

There’s a “save” button you have to click to persist your changes after you’ve toggled the green/red cells of the media-types-per-domain table to suit what you want to block and what you want to allow. i gave up on uMatrix once before figuring that out.