Examine source code of PDF Down

{
  "manifest_version": 3,
  "name": "PDF Down",
  "version": "1.2.1",
  "description": "Find and download PDFs and documents from any page in one click.",
  "permissions": [
    "activeTab",
    "scripting",
    "downloads",
    "storage",
    "cookies"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pdf-grabber@zen-user.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}