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}"
    }
  }
}