Firefox Nord theme customization

I am in love with Nord theme. After successfully moving my Terminal and Sublime Text 4 on MacOS, I wanted to change my browser as well. Firefox is so easy to customize that I decided I will go full Nord on it. So here is a preview of how it looks. I like very minimal setups and the color should be uniform.

Firefox custom Nord themeFirefox custom Nord theme

Here are the steps:

  1. Install the Arc Dark Theme for Firefox. That should setup the tabs and menu bar.

  2. The tabs and new windows are still light color, so I went ahead and changed the userContent.css and userChrome.css. This is how you do it.

  3. Procedure

    • Type about:config in the URL bar

    • Search toolkit.legacyUserProfileCustomizations.stylesheets and double-click the field to set it to true

    • Type about:support in the URL bar

    • Look for Profile folder field and click on the open button next to it.

    • Create a folder with the name chrome

    • Inside this folder, create a file userChrome.css and paste the following code inside it :

        tabbrowser tabpanels { background-color: rgb(46,52,64) !important; }
        browser { background-color: #2e3440 !important; } 
    • Then create another file userContent.css and paste the followind code in it :
        @-moz-document url-prefix("about:blank") {
            html > body:empty {
                background-color: rgb(46,52,64) !important;
        @-moz-document url("about:blank") {
            html > body:empty {
                background-color: rgb(46,52,64) !important;
        @-moz-document url("about:newtab"), url("about:home") {
          body {
            background-color: rgb(46,52,64) !important;
  4. Finally, set your Homepage and new windows to about:newtab

  5. Completely quit and restart firefox

  6. Enjoy

Customization Firefox Nord themes

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