Limit               PostgreSQL 9        Firebird 2.x
--------------------------------------------------------
Maximum Database Size       Unlimited          Terabytes
Maximum Table Size          32 TB              ~32 TB
Maximum Row Size            1.6 TB             65,536 bytes (64 KB)
Maximum Field Size          1 GB               
Maximum Rows per Table	    Unlimited          > 16 Billion 
Maximum Columns per Table   type-dependent     type-dependent
                            250-1600           (ex: 16,384 int cols/table)

I don't see problem points in either list of limits.

Firebird--:  Rowsize is somewhat small.

PostgreSQL--: Max columns per table is a bit low.