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Some features available on other platforms are not implemented:
- Native audio (requires OSS backend, feature parity with ALSA or PulseAudio)
- Encrypted Media Extensions (requires Widevine CDM binary)
- Process sandboxing (requires Capsicum backend)
- Reduced memory usage (requires mozjemalloc)
- Crash Reporter (requires Google Breakpad and reproducible builds)
- Performance profiling (requires GeckoProfiler)
- Gamepad API (requires libusbhid backend)
- WebVR (requires open source runtime)
- TCP fast open
- about:networking (requires link state notification)

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On FreeBSD < 11.3 Web Content process may frequently crash due to bug 181741.
If you cannot upgrade try applying the following workaround:

$ sysctl net.local.stream.recvspace=16384

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To select non-default audio backend open about:config page and create
media.cubeb.backend preference. Supported values are: alsa, jack,
pulse, pulse-rust, sndio. Currently used backend can be inspected
on about:support page.

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smb:// issues (Gvfs/GIO option):
Network group, machine, and share browsing does not work correctly.

sftp:// (Gvfs/GIO option):
Only sftp access using public key authentication works.  To easily
setup public key authentication to "remote_host":

ssh-keygen
cat ~/.ssh/id_rsa.pub | ssh remote_host "cat >> .ssh/authorized_keys"

The SSH server on remote_host must allow pub key authentication.

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