Examine source code of YouTubeUtils

{
  "manifest_version": 2,
  "permissions": [
    "<all_urls>",
    "storage",
    "tabs"
  ],
  "icons": {
    "32": "icon-32.png",
    "64": "icon-64.png",
    "128": "icon-128.png"
  },
  "background": {
    "scripts": [
      "src/scripts/background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icon-32.png",
    "default_popup": "src/popup/index.html",
    "default_title": "YouTubeUtils"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "src/scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{034d548e-9728-4e5a-9133-8ea588e47200}"
    }
  },
  "name": "YouTubeUtils",
  "description": "Play videos at the highest quality, dynamically resize video player, extra hotkeys such as to loop video, and more!",
  "version": "1.14.0"
}