Examine source code of Auto Refresh Tab is

{
  "manifest_version": 2,
  "name": "Auto Refresh Tab",
  "version": "1.0",
  "description": "Automatically refresh the current tab at specified intervals.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f2969e35-9650-4514-b59a-50cf4b7af71a}"
    }
  }
}