When they take new designs to user research, one of the questions asked is "Which one of these options looks 'cleaner' in your opinion, A or B?" And when one of the objectives of the org has been declared as "clean up the UI" I'm sure you can imagine why we end up with the disgusting hamburger menus everywhere. And the people who championed a 'win' from such a change will parachute to the next company and do the same thing.
If it's like Firefox, the menu bar shows up when you press Alt.
And with two clicks you can make it permanently visible.
Took me two years to accidentally find this. That's a usability sample.