I’m trying to get himitsu-firefox¹ working on OpenBSD.  It’s 
a Firefox extension that talks to a daemon² using 
“native messaging”: The extension calls runtime.connectNative(); 
the browser spawns a himitsu-firefox-native process, and extension 
and native process exchange JSON messages.

The native process wants to talk to the daemon using the daemon’s 
socket in $XDG_RUNTIME_DIR/himitsu.  Problem is, the 
himitsu-firefox-native process’s environment is empty—it doesn’t 
get no XDG_RUNTIME_DIR variable, or any other one.

How come?  Is that documented somewhere?  Can I change that 
somehow?

I’m on -current, using firefox-esr.

¹ https://git.sr.ht/~sircmpwn/himitsu-firefox
² himitsud: https://git.sr.ht/~sircmpwn/himitsu