There is more than one method for doing this but the best method is probably to use the bookmarks library.

• see how do I use bookmarks?

Note also that

• the name displayed on the bookmarks may be edited, to shorten the display space used, even reducing it to an icon
• the bookmarks may be nested within folders, so each becomes a dropdown list, of bookmarks or further folders.
• you may also be interested in what are app tabs?

Post back with how you get on.

Yes, thank you: the second mail was sent by error. I followed your advice and managed to get rid of duplicate bookmarks on the bookmarks toolbar, by dragging them into the bookmarks library. Now I have to learn how to erase them from the folders there. They cannot be dragged to trash. Where do I find instructions? I will appreciate your reply.

You need to remove the bookmarks in the Bookmarks Manager (Library) or via the right-click context menu in the bookmarks sidebar.

• Bookmarks > Show All Bookmarks

See also:

• https://support.mozilla.com/kb/Deleting+Bookmarks

Thanks again for your reply. The Edit bookmarks offers now to delete 4 bookmarks; i.e. not only the unwanted triplicate bookmarks in the Bookmarks Menu, but also the one I want to keep in the bookmarks toolbar. It will delete all repeated bookmarks or nothing. I think this is taking too long to sort out. I do not have right click in my mouse - Is that what you mean?

If you use Edit This Bookmark then that means that you have the site open in a tab. In such a case you can remove all copies and then re-bookmark the site once again with a single click on the star followed by another click if you want to change the folder. That is the easiest way to remove bookmarks that have copies.