which means: it doesn't enable playing back MP4 videos at this time.Streaming video decode typically requires H.264 profiles not included yet in OpenH264 and also audio codecs that are not freely available. OpenH264 is for WebRTC only for the time being.With a few specific exceptions (certain Linux systems that don't support sandboxing), OpenH264 is sandboxed for security reasons, and it always runs in a separate process. It can be disabled from the Addon's page. OpenH264 is not packaged with Firefox it is downloaded and updated from Cisco's servers automatically. It is also used when talking to some FxOS devices that are using hardware H.264 codecs to reduce CPU load. OpenH264 is a codec library that has been is used since Desktop Firefox version 33 to help enable real-time communication technologies, like WebRTC, especially in situations where the WebRTC connection may be gatewayed to devices that support H.264 but not VP8.
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