We investigated this. Unfortunately HTML5 audio (especially mobile devices) doesn't offer a lot of capability in that regards.
[1]http://superuser.com/questions/519649/tool-to-bulk-speed-up-...
edit: It looks like FF19 is complaining about the content-type: "audio/mpeg" when changing articles. Not sure what one it is using, but it does manage to play the first article only.