firefox and right-click to open download folder woes

[Icarus Alive]

Hi,

Having followed several posts that seem to have solved this problem in
Ubuntu earlier, I am not able to solve it in Lubuntu.
I am using Firefox 10.0.2. I do have "nautilus" installed, but of-course
the default file-manager is "pcmanfm", and I've tried setting both of those
in "prefs.js" like --
    user_pref("network.protocol-handler.app.file", "nautilus");
also tried with,
    user_pref("network.protocol-handler.app.file", "pcmanfm");

with and without full path for those. Having restarted firefox and retried,
don't think those 2 helped.

Symptoms are that in the Download window if I double-click or right-click
"Open" or "Open containing folder", nothing happens.
Anyone has a similar problem, and knows what to do to fix it, s.t. expected
actions happen ?

thanks,
Icarus
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