Klipper clips Firefox

[kwhiskerz]

When one selects a link in an email, web page, what have you, a klipper 
dialogue pops up offering to open the link in firefox, however firefox does 
not open, or if already open, no tab is created in firefox with the link 
opened therein. I anticipated that this would get fixed in kde 4.0.4, but it 
didn't.

Do I need to set something up? In KDE default applications, I have firefox %u, 
but I have also tried the upper selection, which is to open "in an 
application based on the contents of the URL". Neither produce a successful 
result.