FFox 22 installed itself last evening. I paid no attention to it, but this morning the view looks as if I've increased the zoom size by two mouse clicks. Thinking I had, I hit Ctrl-0 to reset to normal size. Nope! That WAS normal size. I tried changing font size to Times NR 12, but that had no effect.
So now if I want what used to be a normal screen, I have to do a Ctrl - two mouse clicks back.