The browser compatibility section of the MDN article[1] lists the various browsers and has footnotes that provide further info on each browser's handling of the situation

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

"Note that SharedArrayBuffer was disabled by default in all major browsers on 5 January, 2018 in response to Spectre."

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