Examine source code of Auto Tab Switcher

{
  "manifest_version": 2,
  "name": "Auto Tab Switcher",
  "version": "1.0",
  "description": "Automatically switches between tabs every X seconds",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Auto Tab Switcher"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe024bbf-c747-4093-a26f-10bcc2ffc6d9}"
    }
  }
}