Examine source code of Youtube auto-pause

{
  "manifest_version": 3,
  "name": "Youtube auto-pause",
  "version": "0.0.1",
  "description": "Automatically pauses youtube videos when you leave the tab with automatic resume and respecting manual pausing",
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "permissions": [
    "tabs",
    "scripting",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42da92b8-1a85-4dfb-bbe3-08e6e7b82b3f}"
    }
  }
}