Intent to ship: OpaqueResponseBlocking (ORB)

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Sean Feng

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Sep 1, 2023, 10:34:52 AM9/1/23

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Hi all,

I intend to turn OpaqueResponseBlocking on by default on desktop starting with version 118. It has been developed behind the browser.opaqueResponseBlocking and browser.opaqueResponseBlocking.javascriptValidator preference. We have a few other ORB related prefs, though they don't need to be changed.

ORB has been enabled by default on Nightly and Early Beta since 113 and on full Beta since 115. We launched the staged rollout to Release users from 116 starting with 1% and currently at 20%. Based on the analysis, including telemetry, web-compat reports and comparison with Chrome's implementation, we believe ORB is ready to be shipped.

Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1851143

Standard: https://github.com/annevk/orb - Although this is not yet merged into the standard, there's a broder support of this given we have a strong interest in ORB and Chrome has a partially implemented ORB shipped already.

Thanks!

Sean

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