Hi Suksan, Maybe you're thinking of duplicate bookmarks in different folders. Bookmarks are only in one "area". There are multiple ways to access them, though. For example, if you go to Bookmarks Toolbar in Sidebar and delete a bookmark - it will be deleted from your Toolbar. If that same bookmark exists in, say Shopping folder, it will be left there.

The bookmarks that show in "3-bar" Firefox menu button -> Bookmarks have the "Recent bookmarks" label. This is the same for the History menu that have "Recent history". Such recent lists show the result of a query and bookmark you see in this list are stored elsewhere in their own bookmarks folder. Any action you take on a bookmark in this list is done on the actual bookmark. For a bookmark you can right-click a query item and select "Show in Folder" to go to this bookmark.

Talking at cross purposes I think here, let me try again.

Hamburger Bookmarks, just like to add and delete without it doing anything else. I believe this was once possible, correct or not? If correct who can I get in touch with, to try and get this back?

The "Recent bookmarks" section (pictured below) lists the recently added bookmarks, across the three categories (Toolbar, Menu, Other) in reverse order by Date Added. These are live links, so as you discovered, deleting a search result deletes that bookmark.

I think you probably would prefer to use the Bookmarks Menu button for the toolbar (). You can add it using the Customize panel (Customize Firefox controls, buttons and toolbars). That gives access to all of your bookmarks, not just the most recent.

Alternately, try the sidebar (Ctrl+B). For more information, see: Use the Firefox Sidebar to access bookmarks, history and synced tabs.

Whilst you have been most helpful in your replies, for some reason you are diverting, pivoting, ignoring and simple not answering my questions please:

Hamburger Bookmarks, just like to add and delete without it doing anything else. I believe this was once possible, correct or not? If correct who can I get in touch with, to try and get this back?

I think the hamburger menu has worked this way since Firefox 57. However, in Firefox 57-88, it was

menu > Library > Bookmarks (listing Recently Bookmarked)

and in Firefox 89+ it is

menu > Bookmarks (listing Recent Bookmarks)

Firefox 29-56 were different, but I don't remember bookmarks being listed on that menu.

Anyway, there's no changing how the menu works.

Anyway, there's no changing how the menu works. Why would you be saying this, have you tried, do not know who to escalate this to, as it's not as if my suggestion here is unreasonable?