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@vbsessa
Last active August 31, 2024 12:59
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How to customize Firefox devtools fonts
  1. Open ~/.mozilla/firefox/<your_profile>/chrome/userContent.css (create it if does not exist).

  2. Paste the following content in it.

     @namespace url(http://www.w3.org/1999/xhtml);
     @-moz-document regexp("chrome://browser/content/devtools/**/.*"){
         .devtools-monospace {
             font-family: Consolas, monospace !important;
             font-size: 8pt !important;
         }
     }
    
  3. Restart Firefox.

@aleclarson
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aleclarson commented Nov 5, 2022

I recommend perusing this link if you're having troubles:
https://www.userchrome.org/how-create-userchrome-css.html

And as @jgentil said, replace userChrome.css with userContent.css for devtools customization.

@kidzgy
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kidzgy commented Aug 30, 2024

@-moz-document url-prefix("chrome://devtools/content"){
.devtools-monospace {
font-family: "Cascadia Mono", "Consolas", "Sarasa Gothic SC", "Microsoft Yahei UI" !important;
}
}

put it in userContent.css

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