Old School GitHub

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "name": "Old School GitHub",
    "version": "1.9.0",
    "manifest_version": 3,
    "description": "Revert GitHub's UI back to its classic look (before the June 23, 2020 update that has a flat, rounded and more whitespaced design).",
    "icons": {
        "16": "img\/icon-16.png",
        "48": "img\/icon-48.png",
        "128": "img\/icon-128.png"
    },
    "content_scripts": [
        {
            "matches": [
                "https:\/\/github.com\/*",
                "https:\/\/gist.github.com\/*"
            ],
            "css": [
                "css\/osgh.css"
            ],
            "run_at": "document_start"
        }
    ],
    "homepage_url": "https:\/\/github.com\/daattali\/oldschool-github-extension"
}