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The feature was previously hidden behind a about:config option[0]. Not a ff user but might check if it is back and for now let your users now?

Is chrome or edge affected?

Should the SharedArrayBuffer mdn page be updated; or maybe moz://a will fix it quickly enough to allow it on by default again.

By the looks of it, this will affect a lot of webgl code.

[0]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...



Chrome will be taking the same steps-

> In line with other browsers, Chrome 64 will disable SharedArrayBuffer and modify the behaviour of other APIs such as performance.now, to help reduce the efficacy of speculative side-channel attacks. This is a temporary measure until other mitigations are in place.

https://sites.google.com/a/chromium.org/dev/Home/chromium-se...




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