Bug 993364 - [E.me] [un-xfail] etmmanager.js [r=ranbena]
Bug 993368 - [E.me] [un-xfail] Collections.js [r=ranbena]
Bug 967516 - Enable DEVICE_DEBUG by default for non production builds r=ochameau
Bug 984313 - [Music] @2.25x assets update
Merge pull request #17676 from KevinGrandon/bug_967516_enable_device_debug_default

Bug 967516 - Enable DEVICE_DEBUG by default for non production builds r=ochameau
Merge pull request #18074 from EverythingMe/un-xfail-eme

[993364, 993368] [un-xfail] etmmanager.js, Collection.js
Bug 989974 - Reenable system/HardwareButtons intermittent failing unit test
Merge pull request #18101 from timdream/bug989974-try

Bug 989974 - Reenable system/HardwareButtons intermittent failing unit test, r=kgrandon
Merge pull request #17871 from dominickuo/bug-984313

Bug 984313 - [Music] @2.25x assets update, r=jimporter