When I asked in IRC, I was told U2F was not implemented in browsers on OpenBSD because, "do you really want browsers to have full access to your USB stack?"
You only have access to the devices which you have permission to access. On FreeBSD, we have a devd config that sets the u2f group on U2F tokens.
https://cvsweb.openbsd.org/cgi-bin/cvsweb/www/index.html?rev...
"remove freenode channel from index, it lacks any form of sensible moderation."