I'm trying to use Dolphin as file chooser for Firefox in Archlinux instead of Nautilus. I've read this but it did not solve my problem. The config seems related to firefox as
xdg-mime query default inode/directory dolphin.desktop
Which is right. Also
cat /usr/share/applications/mimeinfo.cache | grep x-directory/gnome-default-handler x-directory/gnome-default-handler=kde4-dolphin.desktop;
Seems to be right too. What am I missing?