$OpenBSD: README,v 1.5 2012/08/04 15:09:35 ajacoutot Exp $

+-----------------------------------------------------------------------
| Running ${FULLPKGNAME} on OpenBSD
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By default, xdg-open(1) opens URLs using a predefined order of known
browsers executables. To change this behavior and set up a default
WWW browser, the "BROWSER" variable needs be set to the corresponding
executable.

e.g. ~/.profile
export BROWSER="firefox"