Update / Refresh / Missing bookmarks
I updated Firefox on my laptop. Then it suggested I refresh. After I did, my bookmarks disappeared. I've been trying to get them back & the restore file was empty. I uninstalled & reinstalled. After I signed back in it removed all the bookmarks from my phone. I am freaking out!
Opaite Mbohovái (1)
This advice is for your desktop:
Refresh should have moved your entire old Firefox settings (profile) folder to the desktop, inside an Old Firefox Data folder.
In your old profile folder you should find a folder named bookmarkbackups and inside there should be several files with dates embedded in them so you can confirm how recent they are. They also will have the number of items (folders + bookmarks) mentioned in the file name so you can see if any are unexpectedly small.
To restore one of those backups to your running Firefox, see the steps in the following article. You'll use the "Choose File" item on the Restore menu to point Firefox up to your desktop and into your old profile to restore an old backup.
Restore bookmarks from backup or move them to another computer
Does that work?