Click the Bookmarks button
on the right side of the navigation toolbarOn the menu bar, click At the top of the Firefox window, click the menu and select to open the Library window.
Click the Bookmarks button
on the right side of the navigation toolbarOn the menu bar, click BookmarksAt the top of the Firefox window, click the Bookmarks menu and select Show All Bookmarks to open the Library window.
Import and Backup and choose Export Bookmarks to HTML....