The first minor release of Firebird 3.0 is available: many bug fixes and several improvements. We recommend updating to Firebird 3.0.1 as soon as possible.
Firebird 3.0.1 Release Notes
Firebird 3.0.1 Download for Windows and Linux
Please note that HQbird (advanced distribution of Firebird) is already updated to be aligned with Firebird 3.0.1. If you are looking for the optimization and high availability tools for Firebird 3.0.1, HQbird is the right choice.