On Mon, 2014-05-19 at 17:39 +0100, Norman Silverstone wrote: > what am I doing wrong? You're using Thunderbird :p. However, you can change the browser invoked by Thunderbird from Firefox to Chrome: http://kb.mozillazine.org/Changing_the_web_browser_invoked_by_Thunderbird JFTR, the executable is /usr/bin/google-chrome-stable .