At Google I/O 2019, Firebase announced the launch of the new web.app domains for all of the sites hosted on Firebase Hosting.From May 28, 2019 onwards, any Firebase-hosted site on the <site-name>.firebaseapp.com domain will also be accessible via the non-Firebase branded <site-name>.web.app domain. Both domains will serve the same content and use the same hosting configuration.The web.app subdomain will automatically be enabled for your site. As before, you will only charged for bandwidth and storage above free quota. Your sites will continue to work with both of the subdomains: firebaseapp.com and web.app, as well as any custom domains you have configured. There are no plans to deprecate the <site-name>.firebaseapp.com domain. No action is required on your part.
Your following projects will be accessible on both subdomains starting May 28, 2019:
|Project||Current subdomains||Subdomains (after May 28)|