You mention 3 different machines 'this box', 'work',
'sons box'. - and
don't quantify any of them correctly. (which OSes do they run?)
Work : FC2, this box, FC3t3, sons FC2
If you ssh into FC3 (from a different machine with older ssh) - you
can run firefox. If you ssh from FC3 into any other machine - you
need 'ssh -y' for it to work.
Note: this is ssh client side option.
Thanks. For one moment I thought I'd found a bomb!
"Trust me, I know what I'm doing" - Det. Sledgehammer