I just landed support for zstd Accept-Encoding support on all platforms
in Firefox 126. This will allow servers to send Firefox
zstandard-compressed streams.
Currently Facebook and associated properties (Instagram, etc) use zstd
encoding extensively, and other sites use it as well when the browser
supports it.
We only enable zstd for secure connections to avoid the CRIME and BREACH
attacks on compressed data, for the same reasons brotli is only used on
secure connections.
Chrome just enabled zstd support in 123 (a short time ago).
/Bug to turn on by default/:
https://bugzilla.mozilla.org/show_bug.cgi?id=1871963
Standard: https://datatracker.ietf.org/doc/html/rfc8878
Platform coverage: all
Preference: adds zstd to network.http.accept-encoding.secure. It can be
disabled by removing this
Other Browsers:
- Blink: Shipped in 123
Safari: https://github.com/WebKit/standards-positions/issues/168
--
Randell Jesup, Mozilla
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