Examine source code of Background Page Requester

{
  "manifest_version": 2,
  "name": "Background Page Requester",
  "description": "This extension will automatically request a given page in a given time period and close it afterwards",
  "author": "Felix Eckhardt",
  "version": "2.1",
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "js/jquery-3.4.1.min.js",
        "js/popup.js"
      ],
      "css": [
        "css/style.css"
      ],
      "matches": [
        "http://*/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "img/icon.png",
    "48": "img/iconLauncher.png",
    "128": "img/icon128x128.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "alarms"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{742301c7-f5e6-4365-ba3f-9d2a020f09b2}"
    }
  }
}