Examine source code of Auto Refresh Pagehg

{
  "manifest_version": 2,
  "name": "Auto Refresh Page",
  "version": "1.0",
  "description": "Automatically refresh the current tab at a set interval.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Auto Refresh"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c6e3aa0-2d12-43e1-a0b3-2972b42b2d64}"
    }
  }
}