RFrfmcbfs> Those are for 2.5 arent them? RFrfmcbfs> The only ones I found there are at RFrfmcbfs> https://ib-aid.com/br/optimized-firebird-configuration/
There is conf for FB 3 too, scroll down the page. []s Carlos Migration Guide to FB 3 - http://www.firebirdnews.org/migration-guide-to-firebird-3