Examine source code of Dolan's Dynamic Theme

{
  "description": "A theme that changes colour to the website",
  "manifest_version": 2,
  "name": "Dolan's Dynamic Theme",
  "permissions": [
    "tabs",
    "theme",
    "storage"
  ],
  "background": {
    "scripts": [
      "vibrant.min.js",
      "background-script.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "version": "1.1.2resigned1",
  "applications": {
    "gecko": {
      "strict_min_version": "58.0a1",
      "id": "sosdylanmc@gmail.com"
    }
  }
}