How do I set the default browser in KDE4 without breaking Dolphin?

Issue

• Setting default Internet Browser breaks dolphin behavior with url
• I tried to change the default internet browser for KDE4, but it turned out that this breaks the behavior of dolphin.
• Dolphin returns an error after changing the default browser to firefox or even konquror.
• Change default via GUI /Systemsettings/Default Applications/Web Browser.
• Error in Dolphin when clicking on URL:

Could not find the programm 'mozilla-firefox.desktop'
     or
Could not find the programm 'kde4-konqbrowser.desktop'

• Dolphin works fine again after removing the default setting firefox/konqueror, with the kde4 default webbrowser: konquror