The bookmarks in the selected HTML file will be added to your Firefox bookmarks within the Bookmarks Menu directory DOES NOT WORK
The current version of FF is a mess. When I installed it, it did not save and reinstall the book marks from the earlier version.
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Where are you getting that bookmark HTML file from?
Firefox doesn't keep the bookmarks.html file in the Profile folder up-to-date since the Firefox 2 versions; it's only there as a legacy file or as a result of creating a new Profile.
Have you tried restoring a bookmark backup?
https://support.mozilla.org/en-US/kb/Backing-up-restoring-bookmarks
See - Restoring from backups