Tor Browser 9.5 allows users to opt-in for using onion sites automatically for the first time. Sites can have their alternate.onion addresses advertised to Tor desktop users who have the ‘Onion Location’ option enabled. The new Tor Browser version will also display error pages to let Tor users know why they haven’t been able to reach onion sites, instead of the Firefox error messages previously displayed when onionsites were unreachable. The Tor Project also includes fixes for high severity security vulnerabilities also included in the Firefox ESR 68.9 release.
Source: https://www.bleepingcomputer.com/news/software/tor-browser-95-lets-websites-promote-their-onion-addresses/