One way to browse GitHub FirebirdSQL code is using this url to read GitHub code with VS Code (read only)
https://github1s.com/firebirdsql/firebird via HackerNews https://news.ycombinator.com/item?id=26083919
Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
