These instructions worked for Ubuntu 12.04 and Firefox 15.1. For comments email ​help@geni.net

• Copy this script in your system

  #!/bin/sh
  eval `echo $1 | sed -r -e 's,(.+)://([A-Za-z0-9_]+@)?([A-Za-z0-9\.]+)(:[0-9]+)?,r="\1";u="\2";h="\3";p="\4",' -e 's,[:@],,g'`
  echo protocol=$r, user=$u, host=$h, port=$p
  PROTO=$r
  USER=$u
  HOST=$h
  PORT=$p
  
  
  if [ -z "$PORT" ];
  then
    /usr/bin/gnome-terminal -e "$PROTO -l $USER $HOST"
  else
    /usr/bin/gnome-terminal -e "$PROTO -l $USER -p  $PORT $HOST"
  fi
  

• Make the script executable
• Follow ​these instructions.
• When the firefox pop-up window comes up to ask you to choose an application for ssh, navigate to the above script

Notice: For some reason the first time you try to access an ssh address it should through a link and not by typing an ssh URL in the location bar.