Looked for the first post that mentions this new Firefox version. It's funny, my Work Profile installation appears to be enrolled in an A/B test for a newer design, while my main profile has the old layout.

Have to say, I seriously disagree with the new layout. The amount of padding and size of every menu item, the misuse of my phone screen, is just absurd. I can't tell if this is supposed to be the normal OoB experience or if my installation suddenly had accessibility accommodations for myopia turned on and set to maximum. I can't share screenshots for comparison, but it's rough.