Examine source code of Quick Playlist Builderok

{
  "manifest_version": 2,
  "name": "Quick Playlist Builder",
  "version": "1.0",
  "description": "Quickly build music playlists by dragging and dropping links from YouTube, SoundCloud, etc.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{95ddb547-b9eb-4969-b660-891b185c2071}"
    }
  }
}