It appears that the firefox-kde-support package is broken right this moment. We're hoping it gets fixed in time for the Kubuntu 12.04 release. Here's the bug report:
https://bugs.launchpad.net/ubuntu/+s...er/+bug/949949
However, the xdg-open workaround mentioned by cendryon is a very good solution. It may even be the best way of doing it. Here are the steps from Canonical support:
Quote:
1) stop firefox
2) rm ~/.mozilla/firefox/<profile>/mimeTypes.rdf
3) start firefox
4) download a file
5) open it from the downloads menu and choose the application. Browse to /usr/bin/xdg-open. then check to remember your choice
Now both open and open containing folder should work. You can then change the preferred programs through kde's file associations settings.
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It works great for me.