Examine source code of yt-speed-toggle

{
  "manifest_version": 3,
  "name": "YouTube Speed Toggle",
  "version": "1.0.0",
  "description": "Toggle YouTube playback speed with the backtick key. Tap to switch between 1x and a configurable speed; hold for a higher speed while pressed.",
  "author": "pwh9882",
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://m.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "action": {
    "default_title": "YouTube Speed Toggle",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.svg",
      "32": "icon.svg",
      "48": "icon.svg"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-speed-toggle@pwh9882",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}