So thought I should write this up so I have a note of it somewhere.
select the "receiver" and download the x64 bit version
open a terminal and cd to the download location
sudo dpkg -i icaclient_12.0.0_amd64.deb
open firefox and goto
edit > preferences > applications > Citrix ICA settings file
change this to "use wifca" rather than "use citrix receiver for linux (in firefox)
should work now :)