Examine source code of Moodle Mass Downloader

{
  "manifest_version": 2,
  "name": "MoodleMassDownloader",
  "version": "1.4",
  "description": "Adds a red border to all webpages matching mozilla.org.",
  "icons": {
    "48": "imgs/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.ac.il/*"
      ],
      "js": [
        "FileSaver.js",
        "jszip.js",
        "jszip-utils.js",
        "mrf.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "*://*.ac.il/*cs/*",
    "downloads"
  ]
}