Examine source code of Switchyard

{
  "manifest_version": 3,
  "name": "Switchyard",
  "description": "Open the current page in Switchyard for browser selection",
  "version": "0.17.2",
  "homepage_url": "https://github.com/alyraffauf/Switchyard",
  "permissions": [
    "activeTab",
    "contextMenus",
    "nativeMessaging"
  ],
  "background": {
    "scripts": [
      "build/background.js"
    ]
  },
  "icons": {
    "16": "icons/switchyard-16.png",
    "48": "icons/switchyard-48.png",
    "128": "icons/switchyard-128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/switchyard-16.png",
      "48": "icons/switchyard-48.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "switchyard@alyraffauf.github.io"
    }
  }
}