Examine source code of Tab Timer1

{
  "manifest_version": 2,
  "name": "Tab Timer",
  "version": "1.0",
  "description": "Limit the amount of time a tab can be open. When the time is up, the tab automatically closes.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd9ef7d3-8906-46ae-b214-175f3b7ad573}"
    }
  }
}