Examine source code of Game Downloader

{
  "manifest_version": 2,
  "name": "Poki Game Downloader",
  "version": "1.0",
  "description": "Downloads the core game file from Poki game pages.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "downloads",
    "*://*.poki.com/*",
    "*://*.poki-gdn.com/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "jszip.min.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/icon-32.jpg"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gamedownloader@github.com.cloudwaddie"
    }
  }
}