Hi somaye.s, Obviously it is nice if Firefox does not crsah, but sometimes for some people it does. Firefox does not take any steps to backup history, and it is unusual if it loses history but there may not be much you can do to recover this.

Can you give more detail about what you have lost. I am assuming it is the history as would be shown in the History Sidebar. (Or is it something else such as the open tabs ? )

The History is stored in a database file called places.sqlite. There is possibility Windows may back that up and allow you to recover it.

Have you figured out the cause of your crashes ? See Troubleshoot Firefox crashes (closing or quitting unexpectedly) and if you need help with that post 2 or 3 recent crash report ID s

Firefox doesn't keep a backup of the history like there is for the bookmarks in the bookmarkbackups folder.

You can check in Windows Explorer if there is a previous version of the places.sqlite file available.

• Right-click: Properties > Previous Versions
• http://windows.microsoft.com/en-US/windows7/Previous-versions-of-files-frequently-asked-questions