> It is a database-independent db management and query tool: as long as
> there is a JDBC driver for it (eg like Jaybird), you can use it to query
> your database, etc. I guess that is the primary reason it is popular.

Few years ago I created an extension of Squirrel SQL to provide more
features of Firebird within the tool. However I do not know in what
state the code is there, whether it is used at all or not. The code was
in their repository.

Roman