Examine source code of Udemy Notes Downloader

{
  "manifest_version": 2,
  "name": "Udemy Notes Downloader",
  "version": "0.1.1",
  "description": "Easily download notes you have created on udemy",
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Udemy Notes Downloader",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "downloads"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.udemy.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{236c4cbf-debc-4a56-ae39-3f7740a3c8b4}",
      "strict_min_version": "105.0"
    }
  }
}