After a system failure all of my bookmarks on firefox disappeared, are they saved in a folder on my computer and how do i recover them?

Question

The system is running on Windows 7, after the restore, all bookmarks and all history prior to the restore were missing

Answer 1

Open a new tab or window. type '''about:support''' in the address
box and press enter.
'''Or'''
Press the '''<Alt>''' or '''<F10>''' key to bring up the tool bar.
Then '''Help > Troubleshooting Information.'''
Under the page logo on the left side you will see '''Application Basics.'''
Under this find '''Profile Folder.''' To it’s right press the button
'''Show Folder.''' This will open your file browser to the current
Firefox profile. Enter the '''bookmarkbackups''' folder. This is
where Firefox makes backups of your bookmarks. Look for the
file you want to restore (check the time / date). Right click on
that file and select '''Copy.''' Now go back to the parent folder
where you started. Right click in the folder and select '''Paste.'''
'''Close FireFox.''' Rename the file '''bookmarks.html''' by adding
'''.old''' to it. The file you just pasted here, rename it to
'''bookmarks.html.''' After you are done, restart Firefox.