Examine source code of Rated Netflix

{
  "manifest_version": 2,
  "name": "Rated Netflix",
  "version": "1.0",
  "description": "Isnt't it annoying to manually check if a show is worth watching? This simple extension inserts IMDB ratings and links on Netflix movie pages to help you decide what to watch.",
  "content_scripts": [
    {
      "matches": [
        "*://www.netflix.com/*"
      ],
      "js": [
        "ratednflx.js"
      ]
    }
  ],
  "permissions": [
    "*://www.omdbapi.com/*",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.svg",
    "default_title": "Rated Netflix",
    "default_popup": "view.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ac679718-a1fb-4d38-8438-b5fdc3dbd78c}"
    }
  }
}