You can use the FBExport tool to generate a dump with inserts. However I am not sure if it is still maintained and works with the latest Firebird versions (it says it was tested against Firebird 1.0 - 2.1).
See Export data from Firebird into pure SQL inserts/ export data from Firebird to MySQL for an example of how to use this tool:
$> FBExport.exe -D "c:\DB\WL.FDB" -U user –P password -Si -V TEST -F test.out
Where:
Si
– means “export to SQL inserts” format
V
– table name to export
F
– output filename