Bedankt voor uw hulp I changed the setting in KDE control center to read "firefox%u" and will see if that makes a difference. I may have to restart KDE so let me see what I can do... I don't think changing anything in Open Office is the solution as many apps use Konq rather than Firefox so I would assume it's KDE not the application that is the problem.
I noticed that when I open a link in another application like Open Office (Writter) it also opens Konq. rather than Firefox.
I am using KDE 3.5.2 and have recently installed Firefox 1.5 and Thunderbird 1.0.7. The problem is when I click a hyper link from an email inside Thunderbird, KDE or Thunderbird uses Konqueror to resolve that URL which I don't want. I have selected Thunderbird as my default mail client and Firefox as my default browser under "Control Center > KDE Components > Component Chooser". Can anyone please tell me how to resolve this annoyance?