The try run from https://tbpl.mozilla.org/?tree=Try&rev=f7e037dc5360 failed additionally due to leaks: TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 3705 bytes during test execution TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 1 instance of CondVar with size 32 bytes TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 2 instances of ImageContainer with size 128 bytes each (256 bytes total) TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 2 instances of ImageFactory with size 16 bytes each (32 bytes total) TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 2 instances of MediaEngineDefaultAudioSource with size 56 bytes each (112 bytes total) TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 2 instances of MediaEngineDefaultVideoSource with size 72 bytes each (144 bytes total) We need to fix these leaks to pref on the automation from bug 781534.

Jason, can you please test locally which part of the test leaks? That would help us to nail that down and get solved faster.

The following basic gUM test already leaks a good amount of data. It's a bit different to what Jason gave in his initially comment, but lets get started with it because it could also fix the other leaks in-place. TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 1483 bytes during test execution TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 1 instance of CondVar with size 32 bytes TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 1 instance of MediaEngineDefaultAudioSource with size 56 bytes TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 1 instance of MediaStream with size 192 bytes TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 1 instance of MediaStreamGraph with size 16 bytes TEST-UNEXPECTED-FAIL | automationutils.processLeakLog() | leaked 1 instance of MediaStreamListener with size 16 bytes

Will be fixed by bug 802538. Duping on that.