Firefox crashes when Windows come sout of sleep mode?

Firefox crashes all too often -- commonly at least once per day for me. This morning I did realize one possible correlation -- I tend to let my machine (Windows 7) go to sleep rather than turn it off. Firefox crashes seem to happen disproportionately when resuming after a sleep. Not right away, but pretty soon afterwards. I can do a little browsing at first, but FF crashes pretty soon after that. I do not know whether the length of the sleep is related -- it often crashes in the morning, and the overnight sleep is a longer sleep than others are. I have no way to know whether this is coincidence or cause-and-effect, but it is happening often enough that I strongly suspect the latter. Since the correlation just occurred to me, I have not (yet) tried the obvious work-around -- exit FF before letting the machine go to sleep. I have looked at several of the crash reports and they all have mswsock.dll on top of the stack. That sound suspiciously like FF is trying to use the network before it is ready, and is unable to cope with the result. FF can usually restore my tabs (etc). Today's case was especially egregious, though, because FF was unable to restore anything -- it offered to try, but I lost all of my active tabs, my tab groups, and my pinned tabs. OUCH! Such features are very helpful, but '''not '''if they are not reliably retained (even across crashes). '''Firefox must reliably preserve such things!'''