ssh with X forwarding runs on the wrong machine

People,

Maybe I am missing something, but I'll risk looking silly...

I am running Xubuntu on an iMac G3. Sometimes I want to run
applications on another computer. So I use

ssh -X otherhost application

and all is well. Except that if I type

ssh -X otherhost firefox

/and/ firefox is running locally, I get prompted or my password on the
other machine ... and then another local instance of firefox starts.
Close the local firefox and the same command runs the remote
application.

I'm baffled. Help!

Ian
.

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