https://support.mozilla.org/en-US/kb/update-firefox-latest-version helps with it on our end today. https://www.mozilla.org/en-US/firefox/57.0.4/releasenotes/?utm_source=firefox-browser&utm_medium=firefox-browser&utm_campaign=whatsnew Microsoft Updated this Date KB4056892 fyi : https://www.howtogeek.com/338269/a-huge-intel-security-hole-could-slow-down-your-pc-soon/

Please let us know if this solved your issue or if need further assistance.

You can check whether SharedArrayBuffer is enabled in your Firefox, and disable it if you like, this way:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(2) In the search box above the list, type or paste shared and pause while the list is filtered

(3) If the javascript.options.shared_memory preference is true, double-click it to flip the value to false

And you are worried about a very exotic attack scenario while you are running a browser with known / public / disclosed security vulnerabilities? This is a little like fearing plane crashes while driving is much more deadly.