Examine source code of Open PDF in Default PDF Reader (Instead of FF)

{
  "name": "Open in PDF Reader",
  "description": "Open PDF links in your system's default PDF reader instead of the built-in browser viewer. Use Acrobat, Sumatra, Preview, or any ext",
  "version": "3.5.0",
  "manifest_version": 3,
  "default_locale": "en",
  "permissions": [
    "storage",
    "contextMenus",
    "notifications",
    "nativeMessaging",
    "downloads",
    "activeTab",
    "alarms",
    "declarativeNetRequest"
  ],
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "context.js",
      "worker.js"
    ]
  },
  "storage": {
    "managed_schema": "schema.json"
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png",
    "512": "data/icons/512.png"
  },
  "options_ui": {
    "page": "data/options/index.html",
    "open_in_tab": true
  },
  "action": {},
  "content_scripts": [
    {
      "match_about_blank": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "data/inject.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "commands": {
    "_execute_action": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24266bb4-208b-4214-b397-0f4db5f23d25}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "host_permissions": [
    "*://*/*"
  ]
}