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HTTP/2 for Firefox is currently under development.
HTTP/2 draft support is included in routine builds of the all firefox channels (with various drafts supported depending on the channel - see below for details). It , but is disabled by default. To get the most up to date support you should use the nightly channel, download from https://nightly.mozilla.org/ To get the (slightly more stable) aurora channel, download from https://aurora.mozilla.org/ To get the (even more stable) beta channel, download from https://beta.mozilla.org/
To enable, go to about:config in the location bar and set network.http.spdy.enabled.http2draft and security.ssl.enable_alpn to true
The current implementation is of draft-12 with compression-07 on nightly, draft-10 with compression-06 on aurora, and draft-09 with compression-05 on beta and release.
Firefox will only be implementing HTTP/2 over TLS - and so far that means for https:// schemed URLs (see below for http:// with TLS support). It does enforce the protocol's >= TLS 1.1 requirement - if a server negotiates HTTP/2 with a lower TLS version it is treated as a protocol error. (there is a preference for changing that for testing purposes if you need it.)
