There are a few ways you can try to restore your bookmarks and bookmark subfolders in Firefox:

1. Try opening the Bookmarks Manager (either by clicking the Bookmarks icon in the toolbar or by pressing Ctrl+Shift+B) and see if your bookmarks are there.

2. If the Bookmarks Manager isn't helpful, try restoring your bookmarks from a backup. You can find instructions for how to do this here: https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them

3. If you can't restore your bookmarks from a backup, you can try manually copying them over from another browser. Instructions for how to do this can be found here: https://support.mozilla.org/en-US/kb/recover-lost-or-missing-bookmarks

We hope one of these methods works for you!

If you right-click the menu button or a toolbar and select Customize Toolbar, you should find the icon there, in which case you can drag it to the toolbar. This article may help with missing data.

https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update

Did everything get huge in your Firefox? If so, you might want to address that first because when text and buttons are larger, of course, fewer of them will fit across the screen.

Firefox 103 now applies the Windows "Make text bigger" setting as a zoom multiplier (Release Notes).

Your options:

(A) If you do not need "Make text bigger" for other applications, the simplest thing you can do is reset that to 100% to resolve the issue:

(B) Firefox 103 has 3 interrelated hidden settings that control the overall zoom level and whether it considers information from the system. This one seems to be working for many people to revert the change:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

More info on about:config: Configuration Editor for Firefox. The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.

(2) In the search box in the page, type or paste ui.textScaleFactor and pause while the list is filtered.

Normally, Firefox will display a bar with Boolean Number String and a plus button. If Firefox displays a row that already has a number value, skip to step 5.

(3) Click the circular button in front of Number and then click the + button to create a new preference. (See composite screenshot below.)

(4) Firefox should display an editing field, and show a value of 0 -- edit the value to 100 then press Enter or click the blue check mark button to save the change.

(5) If the current value of ui.textScaleFactor is NOT 100, then double-click the preference to display an editing field, and change the value to 100 then press Enter or click the blue check mark button to save the change.