apply-css

This add-on injects CSS into web pages. The addons.mozilla.org domain disallows this operation, so this add-on will not work properly when it's run on pages in the addons.mozilla.org domain.

What it does

This extension includes:

• a background script, "night-mode-demo.js"
• a manifest file, "manifest.json"
• a page action

It adds night/dark mode css in browser

What it shows

• It makes the browser output dark.