Almost a great app. The concept is exactly what I want but the functionality still needs some work. It took quite a bit of troubleshooting just to get the blocking to work on any website (a hard refresh--ctrl + shift + r--wound up doing the trick), and as of now, it still doesn't successfully block Twitter, though this appears to have been a known issue for most of 2019. I'm disappointed but cautiously optimistic that the app will get better with a little more time and assistance.

I do love that it's completely open-source and minimalistic, though, and will bump up the number of stars I've rated the extension as soon as the bugs get squashed.