Description from extension meta
Web ページ上の色をグレースケール化して反転します。
Image from store
Description from store
Working in dark mode is easier on the eyes and will allow you to continue writing that important document long into the night, without disrupting your ability to sleep. Sadly, not all web sites have a dark mode, which is where this simple extension comes in handy. It will change the colors on the page by first performing a grayscale (removing colors) and then inverting them (but only by 90%).
The result is a type of dark mode that is not too harsh on the eyes. It can be used on any web site and can be turned on and off in different tabs. All you need to do is add the extension, have it pinned to always be shown, then simply click on the extension icon to turn it on and off.