Examine source code of Kreston Browser Connector

{
  "manifest_version": 2,
  "name": "Kreston Browser Connector",
  "version": "0.0.1",
  "description": "Handles tel: links and routes them to Kreston.",
  "author": "nerds@kreston.tech",
  "browser_specific_settings": {
    "gecko": {
      "id": "nerds@kreston.tech",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_title": "Kreston Browser Connector",
    "default_icon": {
      "48": "icons/icon-48.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "protocol_handlers": [
    {
      "protocol": "tel",
      "name": "Kreston",
      "uriTemplate": "https://demo.kreston.tech/ords/api/20251208/call/to/%s"
    }
  ],
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "notifications",
    "*://*/ords/api/20251208/*"
  ],
  "optional_permissions": [
    "notifications"
  ]
}