Examine source code of Playlist generator

{
  "manifest_version": 2,
  "name": "Playlist generator",
  "short_name": "Playlist gen.",
  "description": "Turns your unused, youtube bookmarks that are laying around into a playlist loop for hours of entertainment!",
  "version": "2.3.5",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "extension-logo.png",
    "default_popup": "popup.html",
    "default_title": "Playlist Generator"
  },
  "permissions": [
    "activeTab",
    "bookmarks",
    "https://www.youtube.com/*",
    "storage"
  ]
}