Examine source code of YouTube Chapter Shortcuts

{
  "manifest_version": 2,
  "name": "YouTube Chapter Shortcuts",
  "description": "Adds global shortcuts for youtube chapter navigation via a native app.",
  "version": "1.1",
  "permissions": [
    "tabs",
    "nativeMessaging",
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube_chapter_shortcuts@crambone"
    }
  }
}