Firefox was using no-referrer-when-downgrade, which only strips refers when navigating from HTTPS to HTTP. They are switching to strict-origin-when-cross-origi

Firefox was using no-referrer-when-downgrade, which only strips refers when navigating from HTTPS to HTTP. They are switching to strict-origin-when-cross-origin, which cuts the referrer down to just the origin when navigating to a different origin.