Examine source code of Auto Refresh Tabxz

{
  "manifest_version": 2,
  "name": "Auto Refresh Tab",
  "version": "1.0",
  "description": "Automatically refreshes the current tab at a set interval.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2118a260-ceff-4244-9c69-4b209797edee}"
    }
  }
}