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Last active February 28, 2025 03:42
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How to customize Chrome devtools fonts
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chrome-devtools.md

  1. Enable #enable-devtools-experiments flag in chrome://flags section.

  2. Open Chorme Devtools and check Settings > Experiments > Allow extensions to load custom stylesheets.

  3. Create the following four files in a dedicated folder.

    3.1. devtools.html

    <html>
<head></head>
<body><script src="devtools.js"></script></body>
</html>

    3.2. devtools.js

    var x = new XMLHttpRequest();
x.open('GET', 'style.css');
x.onload = function() {
    chrome.devtools.panels.applyStyleSheet(x.responseText);
};
x.send();

    3.3. style.css

    body.platform-windows,
body.platform-linux,
:host-context(.platform-windows),
:host-context(.platform-linux) {
    --monospace-font-size: 12px !important;
    --monospace-font-family: "Consolas", monospace !important;
    --source-code-font-size: 12px !important;
    --source-code-font-family: "Consolas", monospace !important;
}

.monospace {
    font-size: var(--monospace-font-size);
    font-family: var(--monospace-font-family);
}

.source-code {
    font-size: var(--source-code-font-size);
    font-family: var(--source-code-font-family);
}

    3.4. manifest.json

    {
    "name": "Custom Chrome Devtools Theme",
    "version": "1.0.0",
    "description": "A customized theme for Chrome Devtools.",
    "devtools_page": "devtools.html",
    "manifest_version": 3
}

  4. Open Chrome Extensions tab, click Load expanded extension and point to the folder containing all four files.

@vbsessa
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vbsessa commented Apr 28, 2024

Updated the CSS and also created a repository with all files.
https://github.com/vbsessa/chrome-devtools

@vbsessa
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vbsessa commented May 1, 2024 •
edited
Loading

Dropped mac support for now.
If someone uses a mac, could please share which class is being used by chrome? Using .platform-mac is breaking things, at least for me.

@BryanFonseca
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Still working. Tried out on Fedora 40.
Thanks. Hero.

@3otis
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3otis commented Feb 28, 2025

Chromium removed chrome.devtools.panels.applyStyleSheet() API.
So, "Uncaught TypeError: chrome.devtools.panels.applyStyleSheet is not a function" occurred. Oh, no!

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