They started going with a minimalist style logo
But for one single day, firefox nightly looked like this
I took a screenshot because I was worried no one would believe me
I don't even use regular firefox anymore, I use mullvad browser and librewolf whenever I'm not using Brave.
The fingerprinting protection in regular firefox sucks, and regular firefox makes connections to google, double-click and other advertising companies, they even make those connections when you open a new tab.
Librewolf, tor and mullvad browser are completely clean and free of bloat