Examine source code of HurryUp

{
  "manifest_version": 3,
  "name": "HurryUp Youtube Extension",
  "version": "0.6",
  "description": "Displays the actual video's length taking playback rate into account.",
  "options_ui": {
    "page": "options/options.html"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "https://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "assets/images/icon_16.png",
    "32": "assets/images/icon_32.png",
    "48": "assets/images/icon_48.png",
    "96": "assets/images/icon_96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@hurryup.com",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_icon": {
      "16": "assets/images/icon_16.png",
      "32": "assets/images/icon_32.png"
    },
    "default_title": "HurryUp",
    "default_popup": "options/options.html"
  }
}