Yikes. At least Basilisk is a fork of Firefox after it made CSS Grid support public (I don't know how how long it was behind a flag or how much the code changed

Yikes. At least Basilisk is a fork of Firefox after it made CSS Grid support public (I don't know how how long it was behind a flag or how much the code changed in that time). It doesn't bode well for support for other, newer standards, like variable fonts.