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HTTP/2 for Firefox is currently under development.

HTTP/2 draft support is included in routine builds of the nightly firefox-31, aurora firefox-30, and beta firefox-29 channels. It is disabled by default.

To get the nightly channel, download from

To get the (slightly more stable) aurora channel, download from

To get the (even more stable) beta channel, download from

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-10 with compression-06 on nightly, and draft-09 with compression-05 on aurora and beta.

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.)

This build supports basic push and continuations and both alpn and npn.

feedback of any sort welcomed to and

There is a separate build that implements draft-11 (h2-11) with compression-07 that has not yet landed on mozilla-central. It is lightly tested, has no unit tests yet. That code is at with downloads at

There is a separate, more experimental, build available that supports HTTP/2-draft09 for http:// URIs using Alternate-Services (-01) and the "h2t" profile. Sometimes this is known as opportunstic encryption. This allows HTTP/2 over TLS for http:// URIs in some cases without verification of the SSL certificate. That code is at with downloads at .. if you need a server to try this with, you might consider