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Mozilla has added GStreamer in Firefox 24 Nightly on Linux. Mozilla made the decision some time ago to rely on the operating system's capabilities to play some proprietary formats which the organization won't integrate natively in the browser, and GStreamer is that solution on Linux. GStreamer adds H.264 video as well as mp3 and aac audio support on Linux systems with GStreamer so that contents can be played directly in the web browser.
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Firefox up until now supported GStreamer 0.1 only which, while still supported is being replaced with the newer version which means that many Linux distributions will move over to GStreamer 1.0 eventually (or may have done so already).
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Probably the biggest feature addition of Firefox 30 is support for GStreamer 1.0.
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