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09:11, 3 August 2013 http2 for firefox is currently under development. This page contains a link to the most recent build that contains internet-draft level support for it. http2 is not available yet on any of the normal distribution channels (e.g. release, beta, aurora, nightly). Builds here are provided here for the purpose of enhancing interop with other implementations and gaining experience with the protocol to inform its standardization - this space will change rapidly.
The current implementation is of draft-04
It is serial 005 cset 351fc42a655 on try
source is at
https://tbpl.mozilla.org/?tree=Try&rev=351fc42a6557
Builds for windows, os x, and linux are at
http://ftp.mozilla.org/pub/mozilla.org/firefox/try-builds/mcmanus@ducksong.com-351fc42