Examine source code of Anki Dark Mode

{
  "manifest_version": 2,
  "name": "Anki and Python Tutor - Dark Mode",
  "version": "1.0",
  "description": "Switches to dark mode for all webpages matching Anki Web or Python Tutor.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.ankiweb.net/*",
        "*://*.ankiuser.net/*",
        "*://*.pythontutor.com/*"
      ],
      "js": [
        "dark-mode.js"
      ],
      "css": [
        "test-style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ceeb314-4986-4426-b87c-61f5da101420}"
    }
  }
}