i remember KO opened speciffically internet explorer not just default browser (was trying to find iexplore.exe in its directory) and that was how i stopped KO to open default web page on exit (renaming .exe file) and oddly enough internet explorer didnt stop working because it creates another .exe which for some reason KO doesnt recognize anymore :S
i never payed attention in maxko for it and i dont know if it is same procedure, but i searched a bit and found old post on gamers4life:
http://www.gamers4life.com/forums/f21/h ... ore-12361/first procedure was the one i was talking about (renaming) and it worked for me, second one (editing the registry) you do with your own responsibility, if you fubar somehing on your PC, tough luck -> not my problem

i never tried that registry editing, because as i said, renaming worked for me...
edit: in same post a word on "other browsers":
For other browsers, just navigate to its install directory and rename its respective .exe and this should work.
hope it works for ya
regards