This extension is great. I had previously tried the Dark Mode by Bernard extension but was frustrated because it was either everything on or off. It was not easy to whitelist webpages and more often than not websites end up looking weird with dark mode applied to them. But this extension lets me set the site list to inverted listed only so by default it is off and only on for specific domains that I add. That's perfect for me because I would much rather add the few sites I actually want dark mode on than exclude every site where I don't like it.