''locking as a duplicate - https://support.mozilla.com/en-US/questions/895688'' I opened Firefox after a restart and it suddenly crashed (didn't even create a crash report). When I reopened it again, it brought me up to the Restore Session error page and I click Restore. Unfortunately, it did not restore all my windows and tabs and I was missing three windows with tabs. I tried to bring the Restore Session error page and it was empty. Luckily, I was able to recover an earlier version of '''sessionstore.js''' and '''sessionstore.bak'''. However, when I copied them to the profile folder, it just opens one window of my home page. I am not sure what is going on here. Could someone ('''Firefox Tech Support''') please look at these files to see what is going on? I really need those three windows! Thank you for your time, FlipD9