Examine source code of YouTube Remote Control

{
  "manifest_version": 2,
  "name": "YouTube Remote Control",
  "short_name": "youtube-remote-control",
  "description": "Allows you to control YouTube running on your browser from your phone or whatever mobile device.",
  "version": "1.31",
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_action": {
    "default_icon": "icons/48.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "*://*.youtube.com/tv*",
    "webRequest",
    "webRequestBlocking"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "wrybread@sinkingsensation.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}