seamonkey-1.1.18-alt1 First, I did "ssh -X -Y" into this computer, and ran seamonkey. Then, I logged in through wdm on this computer, and wanted to run another instance of seamonkey on this display. But it wasn't possible: $ seamonkey /usr/lib/seamonkey-1.1.18/mozilla-xremote-client: Error: Failed to find a running server. $
It's an upstream bug-o-feature (common for other mozilla products as well as for openoffice.org at least a few years ago).