Examine source code of Universal Image Downloader

{
  "manifest_version": 3,
  "name": "Universal Image Downloader",
  "version": "16.3",
  "description": "Download all images from any webpage with filtering, sorting, ZIP export, and canvas unscrambling support.",
  "permissions": [
    "activeTab",
    "tabs",
    "webRequest",
    "declarativeNetRequest",
    "downloads",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "jszip.min.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icon-32.png",
      "48": "icon-48.png",
      "64": "icon-64.png",
      "96": "icon-96.png",
      "128": "icon-128.png"
    }
  },
  "icons": {
    "32": "icon-32.png",
    "48": "icon-48.png",
    "64": "icon-64.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "inject.js"
      ],
      "run_at": "document_start",
      "world": "MAIN",
      "all_frames": false
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "image-downloader@ozler365",
      "strict_min_version": "120.0"
    }
  }
}