Noooooooooooooo. I just updated and ran into this as well. It is still possible to enable the compact mode from about:config but it looks like the new tab style

Noooooooooooooo. I just updated and ran into this as well. It is still possible to enable the compact mode from about:config but it looks like the new tab style can't be easily changed anymore. Oh well, see if it still hurts in a few days.