This addOn is pretty good, and very welcome.

A problem (or two): books.google.com does not go dark, even though (but the formatting of the options page makes this hard to discern!) I have not added the page to the exclusions. Please fix! Thank you.

Causes a weird behavior: From Youtube main page click on the profile thumbnail on top right > Go to Settings. Now the current tab along with other tabs where a Youtube page is open will keep reloading until you get out of the Settings page.

I very much enjoy this because it feels not so in-my-face with a single illuminating color. It's well-made, but for some reason I can't hover over channel names.

Question for the developer, belav - Have you thought about doing a Facebook Dark theme? It would complete my personal collection of website dark extensions.

It is good! However, need a feature to reset options to default settings. Otherwise, you have to uninstall and reinstall the add-on. Thx.