Today I was trying to login in a site and didn't know the password. So I tried to open the "Passwords" tab on the firefox menu. It opened but there were zero logins and passwords there, while I had dozens before. I searched on google and found very few problems like mine, mostly from old posts. The solution presented there had something to do with enabling e10s (multiple process support). I don't know what this is but I saw that multiple process was already enabled on my firefox and I didn't change anything recently. There was a firefox update pending (haven't updated in months) so I did the update AFTER I had these problems. The update didn't solve anything apparently. Then I decided to reinstall firefox but first I wanted to backup some files (bookmarks, passwords, login, etc). This is when another issue appeared. I couldn't copy/paste some of these files. It said I needed a permission. But I'm the "admin" on this PC, only I use this computer, so I should have permissions to everything. I tried changing permissions on the properties/security tab of the file, but everything was already checked to "allow". The only thing that is not checked is "special permissions", but I can't change that. So I thought maybe there is a process open "holding" these files so I restarted windows. After the restart, I still couldn't copy those files. Renaming the files also isn't allowed. Then I decided to come here and post about this problem, but didn't remember my login to this site. So I opened the "passwords" tab again and to my surprise everything was restored there. So my main issue was solved, but I'm still trying to understand what happened. Why I couldn't see the logins and passwords before. And why I can't copy those files to create a backup. A few extra information: I don't use firefox profile, so I don't sign and don't sync with anything. The most recent change to the computer was a windows update (1 or 2 days ago). I didn't change anything else in weeks.