Sorry to hear about your data loss. Both your URL history and your bookmarks were rolled back to an earlier time?

Hopefully you didn't use the Windows "System Restore" feature -- but if you did, please don't use it again until we figure out what's going on.

If you haven't already, could you close out of Firefox and do a normal Windows shutdown and restart to complete any pending updates and release any file locks.

If Firefox again starts up without your recent history and bookmarks, could you check whether your stuff is available in a different profile, as follows:

Profile Manager Page

Profiles are individual data folders. Firefox may have one or many. To view your profiles:

In a new tab, type or paste about:profiles in the address bar and press Enter/Return to load it.

Each listed profile has a name in large letters, and a little data table with some buttons. Do not use any Remove buttons!

The profile that Firefox is currently using will have this:

This is the profile in use and it cannot be deleted.

Do you have another profile named default or default-longnumber listed on this page? If so, you can check whether it is the one you were using more recently by clicking its Launch profile in new browser button.

If it isn't what you want, simply close that new window.

If it IS what you want, back on the about:profiles page, click the Set as default profile button for that profile so Firefox uses it automatically at the next startup.

Any progress so far?

It is possible that there is a problem with places.sqlite and that Firefox isn't able to update places.sqlite, so you are stuck with an older places.sqlite copy.

If you use Sync then best is to disconnect Sync temporarily during troubleshooting.

You can check for problems with the places.sqlite and favicons.sqlite files in the Firefox profile folder.

• use "Verify Integrity" button on the "Help -> Troubleshooting Information" (about:support) page

In case errors are reported with "Verify Integrity" close and restart Firefox and retry.

If "Verify Integrity" cannot repair places.sqlite, rename/remove all places.sqlite and favicons.sqlite files in the Firefox profile folder. Firefox will rebuild places.sqlite and restore the bookmarks from a recent JSON backup in the bookmarkbackups folder.

• keep a backup copy of places.sqlite in case a new places.sqlite database has to be created

See also:

• https://support.mozilla.org/en-US/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file
• https://support.mozilla.org/en-US/kb/fix-bookmarks-and-history-will-not-be-functional

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• https://support.mozilla.org/en-US/kb/Profiles

Removed places.sqlite and favicons.sqlite files in the Firefox profile folder. Restarted firefox and all is now well . Thanky you for this help.