Descriptive Problem Summary: When using the Jazz plugin for Firefox, .Midis fail to loop, leaving the console error: TypeError: this._jazzInstance is undefined ext.js:381

Numbered Steps to Reproduce Problem:
1) Host a game which has looping midis, and join the game using the Web Client with Firefox, having the Jazz plugin installed and used.
2) Wait for the song to finish and begin again.
3) Observe that the song is not played again, and the above runtime error is displayed in the console.

Expected Results: For midis to be looped as expected.

Actual Results: Midis are only played once, then run into an error.

Does the problem occur:
Every time? Or how often? Everytime.
In other games? Yes.
In other user accounts? Untested.
On other computers? Untested.

When does the problem NOT occur? Unknown.

Workarounds: Unknown.