Examine source code of AOL mailto

{
  "manifest_version": 2,
  "name": "AOL mailto",
  "version": "1.0.1",
  "description": "Add AOL Mail as a default email provider for all mailto links.",
  "author": "Wesley Branton",
  "developer": {
    "name": "Wesley Branton",
    "url": "http://addons.wesleybranton.com"
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "aolmail@computerwhiz",
      "strict_min_version": "57.0"
    }
  },
  "protocol_handlers": [
    {
      "protocol": "mailto",
      "name": "AOL Mail",
      "uriTemplate": "https://mail.aol.com/webmail-std/en-us/ComposeMessage?to=%s"
    }
  ]
}