Firefox 55.0.2 update will not restore previous session
Yesterday Firefox updated to version 55.0.2 when I started it. When I then tried to restore the previous session, it remembered the first tab in the previous session and none of the others. I thought this might be a glitch simply between the two versions, but I now see this is not so. I just logged off with several tabs open, and when I returned and selected "Restore Previous Session" it again restored only the first tab. In both instances all of the other tabs appear as just blank tabs.
I am new to these forums, so please forgive me if this has been asked before. I did do a search and could not find this particular problem pertaining to the latest update. Is anyone else having this problem? Is Mozilla aware of it? Is there any solution? I am, in case it matters, using Windows 7 Ultimate and my current (up to date, it tells me) version of Firefox is 55.0.2 (32-bit).