Examine source code of Window Image Downloader

{
  "manifest_version": 2,
  "name": "Window Image Downloader",
  "version": "2.1.1",
  "description": "Download pictures from multiple pages at once",
  "browser_specific_settings": {
    "gecko": {
      "id": "firefoximagedownloader@gmail.com",
      "strict_min_version": "117.0"
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "scripting",
    "downloads",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon-16.png",
      "48": "images/icon-48.png",
      "128": "images/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}