Firefox croaks trying to launch evince

[Sam Varshavchik]

For some reasons Firefox can't open .pdf files by default on one of my 
machines.

On the first machine, after clicking on a PDF file, Firefox pops up the 
usual "What should Firefox do with this file?" dialog, with "Open with: 
Document Viewer (default)" setting. Clicking OK downloads the PDF file, then 
opens it inside Firefox's window.

On another machine, after doing the same thing, Firefox downloads the PDF 
file, the croaks with this error dialog:

"/tmp/<filename> could not be opened, because the associated helper 
application does not exist. Change the association in your preferences".

I can manually open /tmp, and launch the PDF file, which opens in evince 
normally. Both firefoxes have the same "PDF document" setting in 
Preferences/Applications, and both machines have identical /etc/mozpluggerrc

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