On the bookmarks toolbar I have many bookmarks that are nested in subfolders.
For example, in google chrome I can open a subfolder and open several bookmarks I want with a middle mouse button click, i.e. the wheel.
But if you try to click on a bookmark with the wheel in Firefox, the subfolder will immediately close and a new page will come to the foreground, so you can't open several bookmarks at once, you will have to open a subfolder each time.
I suggest making it so that bookmarks can be opened in the background without closing the bookmarks subfolder.