I've used various Linux desktops with KDE, and for the life of me, I can't figure out the functional difference between Konqueror and Firefox. Aside from Konqueror doubling as a file browser, of course. (Which I do still prefer to Dolphin.)
Oi. Don't diss the fish.
Konqueror and Dolphin are used interchangeably and I simply can't live without either. Kinda like socks and undies: both are required.