# grep ^MimeType /usr/share/applications/kde4/kfmclient_html.desktop /usr/share/applications/kde4/konqbrowser.desktop /usr/share/applications/kde4/kfmclient_html.desktop:MimeType=text/html;application/xhtml+xml;application/xml; /usr/share/applications/kde4/konqbrowser.desktop:MimeType=x-scheme-handler/http; # grep ^Exec /usr/share/applications/kde4/kfmclient_html.desktop /usr/share/applications/kde4/konqbrowser.desktop /usr/share/applications/kde4/kfmclient_html.desktop:Exec=kfmclient openURL %u text/html /usr/share/applications/kde4/konqbrowser.desktop:Exec=kfmclient openProfile webbrowsing This causes applications (such as Thunderbird 31) using the the x-scheme-handler/http mime type to select konqbrowser.desktop to open URLs. However, that file does not use %u in Exec to allow it to open the desired URL so the user gets the home page. I believe that the MimeType entry needs to be moved to the kfmclient_html.desktop file. You may also want to add x-scheme-handler/https as well (and maybe others?).
Bug 297491 might be related
This is an issue in Fedora RPMs.