965790 - Udacity HTML5 Game Development course fails

Status: RESOLVED DUPLICATE of bug 866222

(Core :: JavaScript Engine, defect)

Description

[John Hopkins (:jhopkins)]

- 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

Comment 1

[Boris Zbarsky [:bzbarsky]]

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.  :(