Bug 844248 - Add a custom media stream for camera preview. r=roc
Bug 852049 - [Audio] The default value of Master Volume should be 1.0 if settings don't set a value. r=mwu
Bug 748740 - Crtl+clicking on a link should open it even if content is calling event.stopPropagation() in a click event handler. r=mak

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extra : rebase_source : 98665c040764c5616a8f34d3c33c2a00a8415a77