Just testing tons of dark mode type addons today to honestly just try to fix one single annoyance on one single site that has issues with a small on site popup that shows recent notifications. I have to admit that I don't really like messing with extra stuff if I don't have to either. However, this addon has fixed my annoying problem and worked well so far on a few quick test sites right out of the 'box'. I do have to say that I notice a whee slow down as people have mentioned about, but it's minimal (to me). So far this has been the first addon though to do all things dark just right where I need that, and also actually makes it super easy to whitelist/blacklist sites with a click. I'm still going to go searching for more tests with more addons, but so far this one gets everything right pretty much from my tests for this current version.