On Thu, Aug 29, 2019 at 1:47 PM Anne van Kesteren <ann...@annevk.nl> wrote:
> We might ship 1 and 2 on Nightly to see what kind of breakage that
> gives. A risky part of this plan is that folks will have to test for
> postMessage() rather than SAB support going forward.

Enabling the prototype on Nightly can be tracked using
https://bugzilla.mozilla.org/show_bug.cgi?id=1594748. It appears to be
on track for 72. (It will not ride the trains. There'll be an intent
to ship when that happens.)

We also created a non-Release preference
dom.postMessage.sharedArrayBuffer.bypassCOOP_COEP.insecure.enabled
that can be used for playing with SharedArrayBuffer without requiring
these new HTTP headers to be set (you'll also need to enable
SharedArrayBuffer via javascript.options.shared_memory). (At some
point we probably need to create a more holistic strategy for our
various insecure preferences, that also involves DevTools.)
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