Examine source code of GitHub Pitch Black Theme

{
  "manifest_version": 3,
  "name": "GitHub Pitch Black Theme",
  "version": "2.0.0",
  "description": "A zero-latency, high-performance pitch black theme for GitHub with neutral colors. No JavaScript, no tracking, pure CSS.",
  "browser_specific_settings": {
    "gecko": {
      "id": "github-pitch-black@ztrahmet.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png",
    "256": "icons/icon256.png",
    "512": "icons/icon512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*",
        "https://gist.github.com/*",
        "https://support.github.com/*",
        "https://docs.github.com/*",
        "https://education.github.com/*"
      ],
      "css": [
        "theme.css"
      ],
      "run_at": "document_start"
    }
  ]
}