If you visit about:protections in a browser that is signed in to Sync, you can see a "Firefox Monitor" report card informing you whether you've been in a data breach.
If you visit about:protections in a browser is is not signed in to Sync, you will see an option to "Sign Up for Breach Alerts" which, when clicked, will direct you to https://monitor.firefox.com in a new tab. You can sign in with your Firefox Account in this new tab and view your breach alerts on the web. But if you return to about:protections you will still see the "Sign Up for Breach Alerts" button, because about:protections uses the signed-in state of the Browser, and you only signed in on the Web.
Bug 1570565 tracks the work to decouple "signing in to Firefox" and "enabling Firefox Sync", which will put us in a better position to offer other account-based services the browser. The Monitor card in about:protections is a great candidate for taking advantage of this.
So...let's make it so that clicking "Sign up for Breach Alerts" in about:protections will sign you in to the Browser and result in your Monitor report being displayed inline.
I put together a strawman UX proposal for how this could operate, without diving in to any of the technical details. Betsy, Ryan, I'd like to get your initial impressions:
Shane, could you please also take a look when you have a moment? There are some technical details implied even at this early stage that I'd like to discuss with you.