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Import (on your desktop): Import Bookmarks from an HTML file.
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Export (on your laptop): Export Firefox bookmarks to an HTML file to back up or transfer bookmarks.Back up: Restore bookmarks from backup or move them to another computer.Of course, it's a good idea to make a backup in case your desktop bookmarks get really messed up with duplicates. However, you can use the export/import feature, grab just the folder you want, and delete the rest of the import. (3) You are correct that the backup/restore feature is a complete replacement. Then you can go over to the Library window (see #1) and move that folder back where you want it. If you click the blue star, then next to the name of its current folder location click the button with the "wide v" icon, Firefox should show you where in the hierarchy that bookmark is saved. If you remember a bookmark in the missing folder and go to that page, the blue star should light up on the toolbar if it still exists somewhere. (2) Sometimes a folder is not deleted but instead gets "misplaced" by being dragged into a different folder. Like most programs, this works backwards through recent changes, so it may not be what you're looking for if you don't want to lose other changes.
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Then look for the Organize menu and see whether Undo is available. (1) If this just happened, you can try using the Undo feature in the Library window.