In about:config, you would be able to enable Mica or Acrylic before this update, I personally loved using this. Always used it. Since the update to the UI, my translucency effects no longer works. I'm not too much of the oval pill tabs, looks ugly in my opinion. Maybe give us a setting to change it to a rectangle or a pill shape, that'd be nice. This UI isn't my cup of tea, and it's throwing me off.
