Unless something changed recently, Firefox never dropped support. It's always been behind a feature flag though. Google gave some reasons on their issue tracker

Unless something changed recently, Firefox never dropped support. It's always been behind a feature flag though. Google gave some reasons on their issue tracker. https://bugs.chromium.org/p/chromium/issues/detail?id=1178058#c84 https://bugs.chromium.org/p/chromium/issues/detail?id=117805...