Munchkin JavaScript error: Error: Permission denied to access property 'type'

I have the Munchkin Javascript on a page on my website, and I use a tool called TrackJS (http://trackjs.com/) to monitor for errors in JavaScript on my site.

In current versions of Firefox (at least Firefox 32 & 33, though it goes earlier than that), I'm seeing the following error for viewers with the aforementioned versions of Firefox:

Error: Permission denied to access property 'type'

TrackJS records the following stack trace for the error:

• x.event.add/v.handle@http://documents.applause.com/static/viewer/common/js/lib/jquery-1.10.2.min.js:5:10803

• c@http://dl1d2m8ri9v3j.cloudfront.net/releases/1.2.5/tracker.js:13:65

• .onInitialize/e.XMLHttpRequest.prototype.send@http://dl1d2m8ri9v3j.cloudfront.net/releases/1.2.5/tracker.js:13:422

• O@http://munchkin.marketo.net/147/munchkin.js:10:150

• H@http://munchkin.marketo.net/147/munchkin.js:10:238

• r@http://munchkin.marketo.net/147/munchkin.js:12:95

• F.init@http://munchkin.marketo.net/147/munchkin.js:17:87

• m@http://munchkin.marketo.net/munchkin.js:6:133

Ignore the lines with tracker.js files, that's just TrackJS' error logging.

Has anyone seen this? Is this something that needs to be addressed by the Marketo Munchkin development team?