When I doubleclick in dolphin (or even run "kioclient exec myfile.fb2", firefox handles this and shows save or run with program dialog. The same happens with *.kdenlive files - instead of kdenlive, firefox is run.
In KDE systemsettings topmost program for *.fb2 is Okular (for *.kdenlive is kdenlive). Right-click menu item "Open with..." in Dolphin for *.fb2 shows Okular as first program, however still firefox is launched on doubleclick. If I select "Open with..." Okular, everything is ok - Okular is launched.
What is th reason for this strange behaviour? How can I change default programs for *.fb2 and *.kdenlive files?