Facebook.com is currently inaccessible to all Firefox users

Facebook's ErrorUtils have recently been updated to use `window.performance.memory`, which is undefined in Firefox and causing an error to be thrown. This value is defined in Chrome. Looks like this was tested in Chrome but not in Firefox.

Firefox 78.3.1esr (64-bit)is working with FB on my old (late `09) Mac Mini.

It's working for me right now using Firefox 76.0.