Examine source code of YouTube SpeedUp

{
  "manifest_version": 3,
  "name": "YouTube SpeedUp",
  "version": "1.2.3",
  "description": "A simple Firefox extension to speed up YouTube videos via scroll on a speedometer icon.",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "exclude_matches": [
        "*://music.youtube.com/*"
      ],
      "js": [
        "index.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{05528bd5-3341-4084-bac0-c3a61d568e44}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}