It worked great for me on Chrome for years, but the Firefox version is way too buggy. As someone else mentioned below, every time I close my browser my blacklist and options reset, and using the Load button to restore my settings doesn't even work. I'm going to have to start using Chrome again just for tumblr (assuming the Chrome version of the add-on still works), because there is absolutely no way I'm going back to having misinformation, fandom drama, unfunny annoying memes and frothing SJWs all over my dash.