Exporting Bookmarks - FireFox
This article explains how to export your bookmarks to an HTML file, which can be used as a backup or for importing into another web browser.
Click the menu button
to open the menu panel. Click Bookmarks and then click the Manage Bookmarks bar at the bottom.
From the toolbar on the Library window, click Import and Backup and choose Export Bookmarks to HTML… from the drop-down menu.
Library window - Export Bookmarks to HTML

In the Export Bookmarks File window that opens, choose a location to save the file, which is named bookmarks.html by default. The desktop is usually a good spot, but any place that is easy to remember will work.
Click the Save button. The Export Bookmarks File window will close.
Close the Library window.
Your bookmarks are now successfully exported from Firefox. The bookmarks HTML file you saved is now ready to be imported into another web browser.