Navigator.id
Not native
This feature is not built into all browsers. To use it reliably, you'll need to include a JavaScript library in your page as a polyfill. You can include the library from https://login.persona.org/include.js.
Summary
The BrowserID protocol defines a new id property on the window.navigator object, through which it exposes the BrowserID API, that is the IdentityManager intreface. This API has gone through several significant revisions. Each generation is listed separately below.
Syntax
JavaScript
Copy Code
var id = navigator.id
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/navigator/id