Two weeks is a long time to suffer with this problem!

Is this problem limited to the Bookmarks Toolbar? Two things to test:

(1) Can you find and load bookmarks from the sidebar (Ctrl+B) - are your toolbar items there either under Bookmarks Toolbar or one of the other two categories?

(2) Can you save a new bookmark (Ctrl+D)?

If everything is gone and you cannot save new bookmarks:

I assume you have done a regular shutdown/restart of your computer since the problem began. However, if you have not, that is the first step, since that will release stubborn file locks.

If problems continue after the restart, could you let us know what you get when you run the "Verify Integrity" diagnosis and repair function. That's here:

Open Firefox's Troubleshooting Information page using any of these methods:

• "3-bar" menu button > Help > More Troubleshooting Information
• (menu bar) Help > More Troubleshooting Information
• type or paste about:support in the address bar and press Enter

Near the bottom, there is a section titled Places Database -- that's the file which stores history and bookmarks. Click the button labeled Verify Integrity. There may be a 10-15 second delay before results appear.

If all is well, the report that appears below the button should start with:

> Task: checkIntegrity
+ The places.sqlite database is sane
+ The favicons.sqlite database is sane
> Task: invalidateCaches
+ The caches have been invalidated
> Task: checkCoherence
+ The database is coherent

Does yours say that, or something else? You can select and copy the report, and then paste it into a reply for review and comment.

Click the button labeled Verify Integrity. There may be a 10-15 second delay before results appear.

Ans: Report did not run.

I had a very large number of Bookmarks. AI say that could be reason for them being lost. There are Fire Fox Backup files in my PC. 15 noted from 7/11/25 to 8/22/25. Properties shows file size 268KB each.

I had similar issues in 2021. Tech helping created file "Old Fire Fox Data" Created 5/21/21 C:\Users\Frank M. Seleno\Desktop = 233GB 67.3K Files 77.5K Folders .....so lots of data. Restoring to this level is better than nothing Booksmarks now totally lost.

The "Old Firefox Data" folder is created automatically when you use the Refresh feature.

Since restarting Windows and Verify Integrity didn't work, try the steps in this article: Fix "The bookmarks and history system will not be functional" error message.