Export and import does not overwrite a user's bookmarks; it appends currently installed bookmarks which may result in duplicated bookmarks every time an "import" is done. IOW, the import feature for bookmarks doesn't weed out duplicates - it just adds to what is already present in the Profile.

jsshackel said

I see methods in Firefox support for exporting bookmarks to or from another web browser, but not specifically for this situation. Also, if there's a way to do this ......

How about this :

Your PC:

Bookmarks icon (next to the star) => Show All Bookmarks => Import & Backup => Export HTML to a USB stick

Your wife's PC:

Bookmarks icon => Show All Bookmarks => Import & Backup => Import HTML from the file on that USB stick

Does that work for you  ?

Note that you can also use Sync to Sync only the bookmarks and only connect when you want to update.

If you only want to transfer some specific bookmarks then you will have to edit the bookmarks.html file and only keep the desired bookmarks in the file. Note that importing an HTML backup always merges the imported bookmarks, so you can easily end up with a lot of duplicates.

Thanks for the help. Exporting to a USB stick is probably the best option, even though I'm copying bookmarks to another user on the same Windows 10 PC rather than another PC. Keeps from having to root around in Firefox files and screw something up or overwrite the other person's bookmarks.

Also thanks for the clarification on the export feature just adding to existing bookmarks and not overwriting them.

Probably a dumb question, but if this is on the same PC : why not create bookmark folders named (e.g.) 'His' and 'Hers'  ?