Using MediaStream.addTrack() to add tracks to a stream obtained using getUserMedia(), then attempting to record the resulting stream now works as expected.The prefixed version of HTMLMediaElement.srcObject has been removed make sure code is updated to use the standard srcObject instead of mozSrcObject ( bug 1183495).Budget-based background timeout throttling has been implemented - see Policies in place to aid background page performance for more details ( bug 1377766).The PerformanceResourceTiming.workerStart property is now supported ( bug 1191943).DOMError is now deprecated, having been removed from the DOM4 spec ( bug 1120178). Errors reported via error objects in certain APIs - for example in the error property of FileReader, IDBRequest, and IDBTransaction, and when requests made via certain methods of RTCPeerConnection are unsuccessful - are now represented by DOMException instances.Gecko has also been given a pref that can be used to disable the interface if required - dom.enable_performance_navigation_timing, defaulting to true ( bug 1403926).The PerformanceNavigationTiming API has been implemented ( bug 1263722).
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