- login to Udacity and join the HTML5 Game Development course - select the Optional Javascript Crash Course - load the first lesson "Inspecting JSON" - without even altering the boilerplate code, click Test Run Expected: graceful handling Actual: Stack trace "before all" hook global leak detected: getInterface Runner.prototype.checkGlobals@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:4230 Runner/<@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:4116 EventEmitter.prototype.emit@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:517 next/<@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:4301 done@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:4021 Runnable.prototype.run/<@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:4033 performTesting/</<@https://assignments-dot-udacity-extras.appspot.com/courses/cs255/unit0/04/test.js?642899:27 Runnable.prototype.run@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:4030 next@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:4296 Runner.prototype.hook/<@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha/mocha.js:4307 process.nextTick</<@https://assignments-dot-udacity-extras.appspot.com/media/js/gamedev/mocha Reproduced on Firefox Nightly on Windows 8 and Firefox Release on MacOS X. Related forum post: http://forums.udacity.com/questions/100041572/global-leak-detected-getinterface

This is a duplicate of bug 866222, right? The site is trying to assert things that just happen to not be true because of the way the Firefox UI pokes at web content here. :(