This is wonderful. My eyes have problems with white backgrounds and white on black is also problematic. But I was easily able to set it to a light grey background with black print. Now, if only it would work on non-browser pages (e.g. Excel, Word, all Windows 10 menu pages... that would be heaven!)
By the way, I ticked the box "Do not set "Override Document Colors" to "never" (not recommended)" which, with its double negatives means "set it to always".
March 15 2025: Firefox (on my PC) has disabled this app and I cannot download the latest version because I am being told "it appears to be corrupt". :-(

Gave everything adwaita colours, you're next.

Works great!

Works amazingly well. Some sites don't look right with the colors but it saves my eyes.

Develope Smart Application and Provide Of Web3

Best dark background ever

It's great to have "Dark Background and Light Text" back on Firefox for Android! 👍

Einwandfrei

ok

Muito bom. E não torna o Firefox mais lento!

many users (and the devs) reported that dark reader slows down firefox dramatically compared to chromium, regardless of which style change option \s you select.

this extension does the same job without slowing down firefox, and it's open source and customizable like dark reader. you may need to try different style change options for different sites, of course. it's a must have extension!