Automatically backup seems to be done each day (sometimes every two days).

You can also make a manually backup:

1. Open the Library (with shortcut Ctrl + Shift + H for example)
2. Click on Import and Backup, then Save
3. Choose a name and a folder to save the backup file

If you are worried about losing your bookmarks, you can active a feature to save automatically bookmarks in HTML format when you close Firefox.

1. Type about:config in the address bar and validate
2. Find the line browser.bookmarks.autoExportHTML
3. Double-click on the corresponding value (false by default) for changing to true
4. Close the about:config tab

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 backup of files that you choose.

OPIE {web link} Import/Export extension preferences

A bookmarks JSON backup is created when you start Firefox when a comparing the current hash with the previous hash shows a difference, but you may have give Firefox some extra idle time if you have a large amount of bookmarks. If necessary then you can create a JSON backup manually. This is an uncompressed backup (.json).

If this isn't happening then maybe do a check of the places.sqlite database.

• Places Maintenance: https://addons.mozilla.org/firefox/addon/places-maintenance/

Thank you Banban, Fred McD, and cor-el for your replies. I believe cor-el's reply provides the information that explains why I did not see a backup file with today's date -- too many bookmarks! LOL! A backup file was eventually created 40 min after my post on this forum. Thanks again.