Yes, dolphin.desktop is in /usr/share/applications/kde4/, but adding the "kde-" prefix still does not make Firefox use it.
Additionally, I've tried using xdg-open for the "file" type in Firefox' preferences, but "Show Containing Folder" still opens Nautilus.
(directly calling "xdg-open /some/dir" works)
It seems like Ubuntu makes it even worse (for me) than stock Firefox - I should focus on the bug report over there (https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/133133).
Yes, dolphin.desktop is in /usr/share/ applications/ kde4/, but adding the "kde-" prefix still does not make Firefox use it.
Additionally, I've tried using xdg-open for the "file" type in Firefox' preferences, but "Show Containing Folder" still opens Nautilus.
(directly calling "xdg-open /some/dir" works)
It seems like Ubuntu makes it even worse (for me) than stock Firefox - I should focus on the bug report over there (https:/ /bugs.launchpad .net/ubuntu/ +source/ firefox- 3.0/+bug/ 133133).