I am trying to access different audio tracks in a video on Firefox, but I am having issues. In order to have the media track button visible in the media player, I enabled media.track.enabled in about:config. However, clicking the button does not reveal a dropdown menu with the different audio tracks like it happens in Chrome. Attached follows a screenshot to illustrate the audio track button I am referencing (headphones icon). Is there another setting I can enable to allow the dropdown to show the tracks?