Examine source code of Page Refresherhjh

{
  "manifest_version": 2,
  "name": "Page Refresher",
  "version": "1.0",
  "description": "Automatically refresh the current tab at a set interval.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f069274-4baa-48dc-8ced-f3d0861ee223}"
    }
  }
}