Update:

It now seems to have magically resolved itself, very weird, as the browser hasn't restarted, only removed the plugin and installed it again. Thanks for the response, if I ever run into the issue again, i will open an issue.
Keep up the great work

Old:

Currently unusable for me, as it makes youtube load forever, which slows my browser down significantly. Even putting youtube in the exclude list didn't fix this, just like using the disable option in the plugin. only way to get youtube to work again is by removing this plugin from my browser

Overall, UltimaDark has replaced the venerable Dark Reader extension for myself. Mostly, down it's speed, and other built in settings to speed it up further. Firefox already isn't the most speedy browser on Android, so anything to keep speed up is a good thing to consider.

That said, it's not all roses. I've had websites not properly set text to a lighter color to keep it legible. It's rather rare, but not so rare — you'll eventually encounter it. It's easy enough to add per site exceptions, but an easy way to set per site color fixes would be a good addition. It is obvious when you should blame the extension, so I haven't been left scratching my head as to why I can't read something at least.

A bug that's easy to reproduce is. Keep tabs alive between Firefox sessions, open a website you need UltimaDark for, close Firefox, then when you reopen Firefox that website will not have UltimaDark applied at all until it's refreshed.

These are minor complaints though, and it's at least worth trying and probably replacing your current dark mode website extension with this.

a great alternative for dark reader! less hit on performance and it actually works on more websites. Ebay was having issues with dark reader but this extension works no problem. Hopefully this projects keep being maintained :)

I used DarkReader for ages but wasn't happy with it because it's so fiddly and its interface and settings are very confusing. UltimaDark however works way better out of the box, exclusions are easy to use and apply, I can export the settings easier. I just like UltimaDark way more. A must have extension for OLED display users.

Wonderful addon - was previously using dark reader with firefox esr but began to experience slowdowns on many sites
thank you thomaz

broken after 144 update of the firefox, tried reinstall, no worky
upd: after the latest extension update it works again, but had to clear the settings in order for it to start working.
Thank you, devs!

It does not work on Android or PC Windows.

Absolutely crazy how well this works and it's faster than Dark Reader

The extension works great and the developer is a cool dude. But on some websites it's just not working well. For example IMDB.com is all garbled up on Firefox on Android, the preview videos fail to load and some images just won't open. Please be kind and fix it.

Thank you so much ThomazPom, you're doing God's work!

Dark mode doesn't work after version 1.6.22! Fix pls!

Update: It works after Add-On reinstall!

After the recent updates the addon became truly amazing. Especially for OLED screen users.

I've used a few different dark mode extensions over the years, but UltimaDark is FAST! Not only is it fast, but it handles websites with progressively loading content far better than even the fabled Dark Reader.

Correcting my last rating. The extension is broke on Ironfox, Iceraven, and Waterfox. Enabling will temporarily keep it running on most sites, but exiting the app will break it.

*Update - the extension might be going through too many growth spurts atm.. it's been hit or miss for the past few weeks. Going back to the heavier/slower Darkreader for the time being.

I'm really glad to see this excellent extension getting an update! For me, one of the biggest hurdles in moving away from Chrome-based browsers has been finding a good dark mode solution. This extension has great potential to remove that hurdle, which is why it's the one I care about the most. The updated modern UI looks fantastic, and I hope more people will discover how great this extension is.

The GOAT dark mode extension has been updated! Thank you for your hard work ThomazPom! Seems to work so much better than before.

Just discovered this extension and really surprised at how its even faster than chromium in rendering dark mode! However, I see there hasn't been any new updates this year. Really hope you don't abandon this awesome project!

1.exclude "google.com.hk" but actually“*.com.hk”
2.how to import dark reader Whitelist？

UD's way more lightweight than the bigger extensions; thank you so much Thomaz!

One issue I've been running into is Twitch streams being covered by the extension. I've tried changing the "precision" value (tried 1, tried 10) and it hasn't seemed to make a difference. Hope you can provide some help with that, but great work otherwise!!

Edit: I see that this issue's been brought up on github back in February. Hopefully progress on that's still going well!

Only using for a few days now, but the performance difference compared to the absurd Night Reader is instantly noticable. It's certainly not perfect yet but after changing to this it's difficult to go back.