Description:

Whenever I play a video on ted.com, the audio is extremely low
pitched (e.g. it sounds like it's being piped through a voice
changer). I have not experienced this on any other websites I
have tested (e.g. youtube.com, somafm.com), and the behavior is
the same regardless of my selected output device.

Steps to reproduce:

1. Navigate to ted.com.
2. Play a video.
3. Listen for distorted audio.

System Information:

$ lsb_release -a
Distributor ID: Debian
Description:    Debian GNU/Linux 9.0 (stretch)
Release:        9.0
Codename:       stretch

$ conkeror --version
Conkeror version: conkeror.mozdev.org conkeror 1.0.3 (Debian-1.0.3+git170123-1)

$ pulseaudio --version
pulseaudio 10.0