So basically this happens randomly to me and I don't know what the problem is. I went to sleep last night and shut my computer down as always. Same old, same old. I booted it up this morning and went on FF to find out my browser history was deleted (Not everything, but all the sites I mainly used were, etc. There was some minuscule searches but nothing outgoing. I was also logged out of every site: Facebook, youtube, gmail, reddit, and many more sites I used. Every site still remembered my username + Password but it logged me outta them all, and it's kinda annoying. Things I have tried & Checked: -History is set to: Always remember history. -Don't have any programs like CCleaner and the such that can do this. -Anti-viruses doesn't delete any of this stuff. -I don't lose cache when closing tabs, browsers, etc. -Add-ons are NOT the problem. I got the same few add-ons on this computer as I do with my laptop (Which has zero problems. -Have the latest Version of FF. -I got no firefox profile that could cause syncing problems. -I just tried replacing cookies.sqlite to see if that'll fix it but idk when this problem will occur again. But as far as I could see, there was no corruption in the other file. -No errors in console. I use Windows 7 Ultimate. I never used to have this problem before, but it happened randomly one day and I'm not sure why. AFAIK, I have only encountered this problem when I open firefox after I shutdown my computer for the night. I am honestly stumped here. I have no clue why this is happening. This has happened three times to me so far in just little over a month. Once about 5 weeks ago, once two weeks ago, and now today.