I've seen this in a few of the tests and it is caused by not having a real channel for the mock xmlhttprequest. Simple patch coming up.
Created attachment 8573055 [details] [diff] [review] patch
Attachment #8573055 - Flags: review?(spohl.mozilla.bugs)
Attachment #8573055 - Flags: review?(spohl.mozilla.bugs) → review+
Pushed to fx-team https://hg.mozilla.org/integration/fx-team/rev/bfc78edb03a7
Target Milestone: --- → mozilla39
Status: ASSIGNED → RESOLVED
Last Resolved: 4 years ago
status-firefox39: --- → fixed
Resolution: --- → FIXED
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