Firefox not opening external applications

[Paul Lemmons]

Ok, I have given up on waiting for the mozilla-acroread plugin to 
surface and I need to be able to open PDFs with FireFox. So I went into 
FF preferences->applications PDF's and changed the program to Okular. 
Now I see the download box appear and the file get downloaded but the 
application never starts. I have tried a number of different programs 
for PDFs and the result is the same: it downloads but app does not 
start. I tried a number of other file types that open in external 
programs and they have the same issue.

Any ideas?
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