Setting environment variables doesn't cause any output, it would be very annoying if they did and would be of absolutely no use. They get set anyway, if you want to check, you can do:
set | fgrep BROWSER
If you set it in the konsole, then you will have to start your program from that same konsole also, the setting only applies to the child processes of that. Setting it in .bashrc or .xinitrc will make it more "global".