Examine source code of YouTube Playback Info

{
  "manifest_version": 3,
  "name": "YouTube Playback Info",
  "version": "1.1.2",
  "description": "Adds info overlay to YouTube videos",
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "src/overlay.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtubeplaybackinfo@orellazri.com"
    }
  },
  "icons": {
    "16": "assets/logo.png",
    "32": "assets/logo.png",
    "48": "assets/logo.png",
    "128": "assets/logo.png"
  }
}