[sneeuwpopsneeuw]

For chrome you have a flag chrome://flags/#enable-force-dark It makes thinks dark but for my tastes the contrast is too high so I combine it with DarkReader to smooth it out more. This flag is not perfect, QR codes are for example not readable anymore by any scanner.

https://chrome.google.com/webstore/detail/dark-reader/eimadp...

solo it works also great in FF https://addons.mozilla.org/en-US/firefox/addon/darkreader/

When you open a new tab you may still get a white flash to prevent this you can use https://chrome.google.com/webstore/detail/whiteslash-white-b...