Examine source code of YouTube Quick Search

{
  "manifest_version": 2,
  "name": "YouTube Quick Search",
  "version": "1.2",
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png"
  },
  "icons": {
    "16": "icon16.png",
    "128": "icon128.png"
  }
}