Right click on the Profile folder and "Restore to previous version" *[[Profiles - Where Firefox stores your bookmarks, passwords and other user data]]

These can't get your data back, but will help in the future. These add-ons can be a great help by backing up and restoring Firefox '''[https://addons.mozilla.org/en-US/firefox/addon/febe/ FEBE (Firefox Environment Backup Extension)]''' {web link} FEBE allows you to quickly and easily backup your Firefox extensions, history, passwords, and more. In fact, it goes beyond just backing up -- It will actually rebuild your saved files individually into installable .xpi files. It will also make backup of files that you choose. '''[https://addons.mozilla.org/en-US/firefox/addon/opie/ OPIE]''' {web link} Import/Export extension preferences