https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226476

--- Comment #27 from Jan Beich <jbe...@freebsd.org> ---
I neither own a microphone or web camera nor smart enough to emulate those in
order to help investigate WebRTC issues.

(In reply to D. Ebdrup from comment #26)
> my webcam feed isn't showing up

Maybe check IPC limits. For one, OpenBSD has smaller kern.shminfo.shmall
default than kern.ipc.shmall on FreeBSD which breaks screen capture.

> it works in Firefox 58

DEBUG build or logging[1] won't help much unless you know what to look for.
mozregression isn't usable on Tier3 platforms like FreeBSD (no upstream builds,
flo@'s buildbot is down for months), so try bisecting source instead. Here's
how to build Firefox outside of ports:

  $ pkg install python27 binutils
  $ hash git 2>/dev/null || pkg install mercurial
  $ hg clone https://hg.mozilla.org/mozilla-unified firefox ||
    git clone https://github.com/mozilla/gecko-dev firefox
  $ cd firefox
  $ hg update release || git checkout origin/release
  $ echo "export COMPILER_PATH=/usr/local/bin" >>.mozconfig
  $ echo "ac_add_options --disable-debug-symbols" >>.mozconfig
  $ ./mach bootstrap # select Firefox for Desktop
  $ ./mach build
  $ ./mach run https://mozilla.github.io/webrtc-landing/

[1] https://wiki.mozilla.org/Media/WebRTC/Logging

> ../../build/unix/gold/ld: error: 
> /usr/ports/www/firefox/work/.build/toolkit/library/../../js/src/js-dtrace.o: 
> unexpected reloc 8 in object file
> /usr/ports/www/firefox/work/.build/toolkit/library/../../js/src/js-dtrace.o:/usr/src/cddl/lib/drti/../../../cddl/contrib/opensolaris/lib/libdtrace/common/drti.c:__SUNW_dof:
>  
> error: unexpected reloc 8 in object file
> c++: error: linker command failed with exit code 1 (use -v to see invocation)

Disable DTRACE option and try again.

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