Playing Opus in Firefox

Older nightly and aurora builds of Firefox have Opus support but it's deactivated by default, so playing Opus in Firefox takes a few simple steps.
  1. Get Firefox Nightly
  2. Type about:config in your URL bar
  3. If this is your first time in about:config it will give you a warning about advanced settings, Click "I'll be careful"
  4. Search for media.opus.enabled
  5. Double click media.opus.enabled to set it to true
You can now play Opus files!