Comment 22 for bug 616447

Firefox is a good case for this potential fix, too. If you have more than one window open, normal quitting will save your session for next time. Close-every-window, from the quicklist Quit, leaves the last window that happens to be closed as your Firefox session on quit. The rest, you closed, as far as Firefox knows.

(Another level of complication: I sometimes have multiple firefox processes from different profiles open at once. bamf groups them as one. But asking it to see the difference may be a tall order. I'm not gonna pursue that one for now.)

Thanks.