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Comment by lukaa | Hacker News Reader

Firefox Preview is great but I don't understand why it doesn't have night mode and neither one of Firefoxes. Today night mode is standard for almost all of the applications and that's the only reason why I simply can not switch to Firefox completely. Btw, don't say that addons are good for since they only switch text in dark not UI. Even Chrome now allows UI to change to dark not just text.

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Firefox Preview supports dark mode for UI. You can switch between light, dark or follow the device theme.

But it doesn't have ability to make text dark so again there is no dark mode.

Websites are complex, you cannot make a script that edits every page to make it both dark and readable when things like the background could be light colored images and fonts that are permanently dark exist

It's actually feasible for most websites, with surprisingly good results. CSS tricks go a long way, even if the website doesn't support prefers-color-scheme.

Give this addon a try (on desktop or mobile Fennec only, obviously): Dark Background and Light Text [0]

[0] https://addons.mozilla.org/en-US/firefox/addon/dark-backgrou...

https://darkreader.org/ works really well, in my experience.

Here's the Twitter homepage in Firefox Preview with dark (device default) vs. light theme: https://i.imgur.com/T2KknGa.png

What else are you asking for?

This is likely Twitter adhering to browser dark theme. OP wants Firefox to handle the dark theme itself and convert all web pages.

Here is the GitHub issue requesting Firefox Preview force dark mode. Firefox for iOS has some CSS hacks to support this, but it can break some websites.

https://github.com/mozilla-mobile/fenix/issues/2139

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