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.

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.

It hasn't actually worked yet. It doesn't change anything about the pages on this website, for example, or YouTube. Something may be blocking it, but I enabled permissions when asked by Firefox. I don't think it's uBlock, because it behaves the same way when that's disabled. Please advise! Or help

Is it possible to set dark mode to automatic based on the ligh/dark theme on my phone? I cant find it..

I thought I would never use dark mode on browsers due to their performance hit. Then I found this.

Fast performance and pretty universal darkening. However, some elements may be incorrectly darkened or look funky (for example, one note writing on web). Also, excluding websites doesn't seem to work (or at least work consistently).

It works great, but too heavy on my browser :(

Truely fastest dark mode!. But I give 4 stars because dark mode is sometime not applied in case: back to previous page, some websites

if it handles accented letters and vharacters it'll get thwe 5 star! well done mate. Would be the best if those are okay. :) keep up!

It seems to work well, with good performance overall, but it indeed breaks some websites. That why it needs a exceptions list feature (if possible with smart segments of url, like: whitelisting .example.com' , 'example.com/subcategorypages' or "subdomainonly.example.com' ), and maybe for later, alternative methods to darken the pages (simple inverse filter, CSS) if the main one doesn't work as expected.
Also, it'd be cool to let the browser highlight with a different color visited links.

Encouragement to the dev!