Firefox is broken :(
I have performed no updates. I have installed no new software.
Firefox runs fine for a varying length of time, but then upon switching from any of several applications to Firefox, Firefox closes its frontmost window. Firefox does not perceive this as a crash, and so does not see it as a session that needs to be restored if I quit and restart. If I only have one Firefox window open, and that one closes on app switch, I have to open a new window anywhere from 3 to 9 times before I get one that "sticks". Firefox opens a new window and the immediately closes it several times before I get a window that stays open.
Firefox runs fine for a varying length of time, but then upon switching from any of several applications to Firefox, Firefox closes its frontmost window. Firefox does not perceive this as a crash, and so does not see it as a session that needs to be restored if I quit and restart. If I only have one Firefox window open, and that one closes on app switch, I have to open a new window anywhere from 3 to 9 times before I get one that "sticks". Firefox opens a new window and the immediately closes it several times before I get a window that stays open.