Examine source code of Playback Speed Controller

{
  "manifest_version": 3,
  "name": "YouTube Playback Speed Controller",
  "version": "2.1",
  "description": "Control YouTube playback speed on YouTube and other sites.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-speed@saurav.dev",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}