Firefox has always been my workhorse for my business, but after the last update, I can no longer open Firefox on more than one desktop on my Mac. Firefox requires me to designate either a specific desktop to open Firefox on--or to open it on all desktops. This doesn't work for me because on each desktop I open a different site on Firefox. I will no longer be using Firefox for work, and since I was using Firefox because of what I perceived were stronger security measures, I am very disappointed. I really wish software engineers would stop "innovating" and fixing things that are not broken.