It does exactly what it's name says and its free! It's great esp since Yahoo.com removed their dark mode.

Soooooooo good for my eyes. Thank you

Do not install. It is a 1-to-1 clone of the original and trusted Dark Reader plugin. The only reason why someone would make this plugin is for stealing user data, bitcoin mining, or some other shady stuff you don't want on your computer.

This dark mode can actually be applied to most websites. Super amazing!

It doesn't look anything like what you see in the screenshot. This extension calls itself "Dark Mode" in the add-ons section, then calls itself "Lights Off - Free" in the addons manager, but in the toolbar it looks exactly like "Dark Reader" which is a more popular addon from a different creator.
I wanted dark websites, not shady extensions!

it is like a branch-version or some thing, but it solved lazy-component's out-of-rendering. so i will give it A 5 STARs.

It works perfectly on Android, and so far it seems to be lightweight.