Not a fan of the new look. If you’re in the same boat, plug:
about:config
into your URL bar, and search for:
browser.nova.enabled
Toggle it to false using the button to the right.
There are functional changes that Nova also introduced: this won’t effect those - only the aesthetic.
Do you have an example? I tried finding a theme that makes the browser look like Netscape Navigator, but the ones I found were lackluster. The icons on the buttons didn’t even change.
This is what I use. There’s even a flatpak app to keep the theme up to date for
https://github.com/rafaelmardojai/firefox-gnome-theme