Examine source code of Audiobook Downloader

{
  "manifest_version": 2,
  "name": "Audiobook Downloader - Archive.org etc",
  "author": "Maximilian Cornett",
  "version": "1.3",
  "description": "Download audiobooks from archive.org with all chapters as mp3 files, cover photo and a chapters.json file for detailed chapter information.",
  "applications": {},
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "https://archive.org/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://archive.org/details/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "zip.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Audiobook Downloader Settings",
    "default_icon": {
      "48": "icon.png",
      "96": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "web_accessible_resources": [
    "*.js",
    "*.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{2c94c86a-ace3-4b8c-a2d7-1eb17821b684}"
    }
  }
}