Separate Issue; Your System Details shows;

Installed Plug-ins

Adobe PDF Plug-In For Firefox and Netscape 10.1.16 Adobe PDF Plug-In For Firefox and Netscape 15.16.20039

Adobe Shockwave for Director Netscape plug-in, version 12.2.4.194 Adobe Shockwave for Director Netscape plug-in, version 12.0.2.122
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer.

Shockwave Director: Shockwave Standalone Installer / Uninstaller{web link} Shockwave Director Version Version 12.2.4.194 http://get.adobe.com/shockwave/

Security Issue: Update your Adobe Reader Version 2015.016.20039 Note: Other Software is offered in the download.

Bookmarks and history are saved in the same file. BBut only the bookmarks are backed up in case of problems.

Unless you have a backup somewhere . . . . .

How was history removed?

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

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 backups of files that you choose.

OPIE {web link} Import/Export extension preferences

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

You can use this button to go to the current Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox