hello crothenb, windows system restore won't restore the file that holds the firefox history unfortunately (it is called places.sqlite). you'd need an existing backup of your firefox [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|profile folder]] in order to get back this kind of data.

No, you probably can't restore deleted history via a Windows System Restore. It is usually best to clear the cache via "Tools > Options > Advanced > Network" or use an extension to avoid clearing other data by accident. *Clear Cache Button: https://addons.mozilla.org/firefox/addon/clear-cache-button/ You can try if there is a previous version of the places.sqlite file available that stores the history and bookmarks. *http://kb.mozillazine.org/Profile_folder_-_Firefox *Right-click in Windows Explorer: Properties > Previous Versions *http://windows.microsoft.com/en-US/windows7/Previous-versions-of-files-frequently-asked-questions *http://windows.microsoft.com/en-US/windows-vista/Previous-versions-of-files-frequently-asked-questions Note that you lose bookmarks that have been added after that restore point, so export the bookmarks to an HTML file to be sure or use a JSON backup. *http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox