I was forced to upgrade when FF crashed the other day, and now all of my windows are sorted alphabetically. This was exactly the behaviour that caused me to switch from Chrome to FF in the first place. I *HATE* having my windows sorted alphabetically. I have certain windows that remain open all the time, and they remain at the top of my Window menu drop-down, for easy access. (Hence, chronological by when the window opened, the old default behaviour.) Now, FF "helpfully" changes the window position every time I change tabs, and I can't find anything. I mentally sort windows by subject matter, not by the name displayed on the tab. I have tens of windows (20-30 typically) open at any given time. This makes it literally impossible to use the Window menu anymore, and I have to tab through open windows searching for what I need.

Mozilla, please make this a configurable option. It was really horrible of you to enforce this on us, just because some squeaky-wheels decided they preferred alphabetical sorting. They clearly are not power users, and this change has crippled those of us who are.