Examine source code of Batch Image Grabber

{
  "manifest_version": 3,
  "name": "Batch Image Grabber",
  "description": "Find the most useful images on the current page, filter them, and download one or many at once.",
  "version": "0.6.0",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; img-src * data: blob:;"
  },
  "permissions": [
    "downloads",
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Batch Image Grabber"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@farwater-batch-image-grabber",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "120.0"
    },
    "gecko_android": {}
  }
}