How to Convert Every Website to Dark Mode / Dark Theme

In this video, I show you how you can force every website to have a Dark Theme or Dark Mode. It works on Google Chrome and Firefox (I haven't tried the other browsers).
Links:
Chrome:
chrome.google.com/webstore/de...
Firefox:
addons.mozilla.org/en-US/fire...
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[@boy3127]

Why does the title of your video say change every website to dark mode / dark theme in the first one you show it doesn't work ? lol