You could remove the extra links, but having a warning that you already have a page bookmarked would be ideal. I do believe that when you try to bookmark an already bookmarked page, the blue bookmark star is already highlighted, at the very least.

Thanks Eve! Yes I have been deleting the extra ones as I find them. Ah I will have to start star gazing! :)

There are extensions that find/remove duplicate bookmarks: https://addons.mozilla.org/en-US/firefox/search/?category=bookmarks&platform=windows&q=duplicate&sort=recommended%2Cusers&type=extension

If you click the star to bookmark a link (tab) then Firefox shouldn't create a new bookmark. You would normally only get multiple copies if you drag a link to a bookmark folder or if you import an HTML backup or if you use Sync to sync bookmarks (there have been issues reported that syncing bookmarks to a mobile device causes this).

cor-el said

If you click the star to bookmark a link (tab) then Firefox shouldn't create a new bookmark. You would normally only get multiple copies if you drag a link to a bookmark folder or if you import an HTML backup or if you use Sync to sync bookmarks (there have been issues reported that syncing bookmarks to a mobile device causes this).

Thanks cor-el. I don't think I've ever used the star to bookmark. Which might be part of my problem. I always went up to the Bookmarks link between History and Tools and clicked Bookmark This Page. I need to pay attention and use the star in the future.

Franz_von_Suppe said

There are extensions that find/remove duplicate bookmarks: https://addons.mozilla.org/en-US/firefox/search/?category=bookmarks&platform=windows&q=duplicate&sort=recommended%2Cusers&type=extension

Thanks Franz I found one that did what I wanted. 439 Dupes of of 9,880-could have been worse!