Nice addon but it seems to mess with icons and some other elements, so I can't have it turned on by default in all new tabs. It would be nice if it were possible to whitelist domains that already have good color schemes.

Also, it took me forever to find the button: it's in the address bar, next to the pocket/bookmark buttons.

edit: no complaints about where the button is, I am just trying to help other people who also do c-f "button" or "find" in the reviews like I did. Thanks for the reply! Unfortunately the other add-on doesn't seem to avoid problems with images, etc and it doesn't have a whitelist feature, so I'll stick with the one that's tab-based!

Thank you so much. Key add-on for developers

Great addon! But I still did not understand how to use it. FF71. Configured the extension itself, the desired colors both in the extension and in the browser, but when I click on a menu item - no changes. Previously, I used toggleDocumentColors and everything was clear there - clicked - my colors - clicked again and the colors from the web page. But the "Toggle Website Colors (Global)" extension works as intended! Help?

Perfect addon! Just what I was looking for! It would be great if you add an option for a keyboard shortcut to change the colors. And the dropdown menus are completely transparent. Maybe if they have a little background (~50% opacity) it would be better.

Thanks for the great work!

EDIT:
It seems that there already is a support for shortcuts. You can set it from the default firefox menu. (Maybe it would be good to add just a short description in the 'About' for how it's done.
https://support.mozilla.org/en-US/kb/manage-extension-shortcuts-firefox

Arbeitet perfekt. Schnell und ohne Probleme. Vielen Dank an den Autor!

This addon is very useful and easily customizable

Hi. Appreciate the work you're doing with this addon.

I have to agree with itaintmebabe. Add the option to toggle Always with Never (FF Options > Fonts & Colors) by clicking on your button. The problem is, the preset colors don't immediately kick in (there's always a slight delay), and it doesn't work on all pages, like mozilla.com, or FF Options page. Also, if I reload a page, the colors go back to web site colors and then switch to preset colors.

Before switching to FF:Q, I was using toggleDocumentColors addon (https://addons.thunderbird.net/de/seamonkey/addon/toggledocumentcolors-198916/?src=userprofile). The way I had it set up in FF Options (Fonts & Colors) was, I enabled "Use system colors" (dark bluish grey background with bright grey text) and changed the links colors. Then I set the Override the colors specified... to Always. toggleDocumentColors would then switch between page colors and my system colors any time I hit the button.

The pages would not wait for the addon to change colors since the setting is set to Always, and the colors would be changed on any page.

wish this had an user definable shortcut key function to toggle, sometimes it takes few on/off to take effect seeing text otherwise hidden

I use dark colors (from Color Preferences) and some sites need standard colors to display text properly. This is where this extension comes to the rescue. The fastest I tried,

Great extension, one that will become very popular with Mac users now that Apple is offering Dark Mode in 10.14.

I agree with zdeefe's comment that website dropdowns and titlebars should be made opaque for better readability.

A keyboard shortcut would be very useful too!

This addon can easily change the background color.Very useful.
Fonts are easier to read on sites with black background colors. I want to use this addon forever.

Thanks Manuel - great add-on for people who use dark themes!
One suggestion:
panels, dropdowns, etc have transparent background, so you can also see content from below as well as content on the dropdown - can make reading difficult
maybe could be fixed with this change:
* {
color: $TEXTCOLOR !important;
background: $BACKGROUNDCOLOR !important;
}
Otherwise *****
Thanks, Steve

With this extension You don't need Stylish or alike 'heavy maintenance' addons.

No good for me. I prefer high contrast white text on dark background, but occasionally I want to see the website colors. It would be better to toggle the website colors with either the Firefox or the system colors, according to the user's preferences. Just toggle Always with Never.

NOW PERFECT! THE BUG WAS FIXED, thx Manuel!! I confirm the recent "Bug"! I cannot change the visited link color...I change the color but the change does not show up on the web page after page reload. Should be something simple? Thank you Manuel Reimer for your fine work.

das geilste was es gibt wenn mann meist Nachts unterwegs ist, sich aber Sachen anzeigen lassen muss über den Browser, ständig ist man geblendet, mit der Erweiterung ist das Geschichte, in die Adresszeile gelegt - ein Klick und die Seite ist dunkler Hintergrund und weisse Schrift, da kann man nur danke sagen an den Entwickler

It's simple and it works. Having this add-on saved me the time of updating my old toggle doc colors add-on to work with Web Extensions, so thank you!

Works as advertised. 4 Stars for being effective and simple.

Would be nice if you have a black-list of domains it works on automatically though, so not 5 stars ;)

It's a useful extension for Firefox Quantum. The ability to put the On/Off toggle in the address bar gives me the ability to reduce eyestrain by SHUTTING DOWN all those BLINDING WHITE websites!!!! I can reset every page at need to a soothing Lite Grey Background.

Why do all Programmers and Web Developers think everyone is from Krypton or something?!?!? Everything is Great...until your head starts SPLITTING!

Kudos, Manuel!