I have this problem in my FIREFOX toolbar. I have a very large set of bookmarks in a drop-down list under a folder called Daily. I have added a folder in that drop down list called Dollar, to keep the whole list short enough to fit in the window. I added four bookmarks to that Dollar folder successfully, but when I tried to add a fifth, it did not show up. I tried that three times. No luck. Then I clicked Open all in Tabs under the four. Seven tabs opened - the four I can see and the one I could not, three times. When I look at that folder in Organize Bookmarks, I can see all seven, but not when I go there from my Bookmark toolbar. How can I make the three invisible bookmarks visible?