Probably one of the best, if not the best addon made in the era of digital addiction. What really makes this the best is the level of customization it allows. One feature I've been using for some time is the grayscale one. Making everything grayscale just makes watching videos for hours much less engaging, which is good.

One thing I was not able to do however (and that's not really a flaw, but more of a very specific combination of rules) was to be able to make all pages grayscale except ones that have .png, .jpg, .jpeg, etc on their url. I've tried * +*.jpg +*.png +*.jpeg but I was not able to make it work this way, even though it works with more clearly defined urls.

Anyhow, many thanks for making this.