Examine source code of Dracula Theme GitHub

{
  "name": "Github Dracula Theme",
  "version": "1.1.0",
  "description": "Custom Dracula Theme for Github.",
  "content_scripts": [
    {
      "css": [
        "dracula.css"
      ],
      "matches": [
        "https://github.com/",
        "https://github.com/*",
        "http://github.com/*/*",
        "http://github.com/*/*/*"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{5fbbb77e-465d-41ae-a5c3-3eebce0c0005}"
    }
  }
}