Examine source code of url2app

{
  "name": "url2app",
  "description": "Open any page or link in any external app. No running native client required.",
  "version": "1.3.2",
  "manifest_version": 3,
  "homepage_url": "https://github.com/shvchk/url2app",
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus"
  ],
  "icons": {
    "16": "images/logo-16.png",
    "32": "images/logo-32.png",
    "48": "images/logo-48.png",
    "96": "images/logo-96.png",
    "128": "images/logo-128.png"
  },
  "action": {},
  "options_ui": {
    "page": "options/index.html",
    "browser_style": false
  },
  "background": {
    "scripts": [
      "worker.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "url2app@shevchuk"
    }
  }
}