Examine source code of Switch Tabs

{
  "manifest_version": 2,
  "name": "Switch Tabs",
  "version": "1.0.0",
  "description": "Switch tabs every x seconds.",
  "background": {
    "scripts": [
      "./js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "./img/icon-disabled.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ad0ed62f-9d88-4ca0-9957-75adaad2db98}"
    }
  }
}