The product is currently in the testing stage and only available as a browser extension for Firefox. Plus, you’ll have to request an invite on the site to get it. [Read: Original Streets of Rage soundtracks re-released — on cassette] The inner workings of this product are similar to what Sign in with Apple does while requiring an email ID. However, just to be clear, this is not a sign-in service. Firefox Private Relay’s code is open-sourced. You can check it out here. The service will generate a unique alias for you every time you sign up with a new website. The company says you’ll be able to delete or disable aliases anytime you want. This is quite useful when you’re visiting a site just to try its service or check out its content, or signing up for a newsletter. As per a report from ZDNet, the firm will formally launch the service later this year.