Fx80 adds prefers-contrast with pref (#6502)
Fx80 adds prefers-contrast with pref (#6502)

Refer to https://bugzilla.mozilla.org/show_bug.cgi?id=1506364
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data