Examine source code of IMGrabber - Bulk Image Downloader

{
  "manifest_version": 3,
  "name": "IMGrabber",
  "version": "1.0.8",
  "description": "Image downloader with per domain config presets, grabs all of the filtered images on a web page.",
  "action": {
    "default_popup": "popup.html",
    "default_title": "IMGrabber Controls"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "downloads",
    "storage",
    "activeTab",
    "tabs",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icons/icon48.svg",
    "96": "icons/icon96.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@imgrabber.persistent_avenger",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}