Examine source code of NPC Generator

{
  "manifest_version": 2,
  "name": "NPC Generator",
  "version": "1.11",
  "description": "Randomly generates NPC details.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "npcgenerator@powerwordspill.com"
    }
  },
  "permissions": [
    "storage",
    "https://gist.githubusercontent.com/powerwordspill/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src https://gist.githubusercontent.com/powerwordspill/ https://powerwordspill.com https://www.youtube.com; style-src 'self';",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}