The Sound.js object was recently modified to work with the audio plugin. In the course of doing this, handling for the case where base64 data is directly included was not added for browsers that don't include Web Audio support, such as FireFox and IE. This is directly related to this issue for the John Travoltage simulation: https://github.com/phetsims/john-travoltage/issues/29.
The Sound.js object was recently modified to work with the audio plugin. In the course of doing this, handling for the case where base64 data is directly included was not added for browsers that don't include Web Audio support, such as FireFox and IE. This is directly related to this issue for the John Travoltage simulation: https://github.com/phetsims/john-travoltage/issues/29.