I'm not sure when the problem started but it was after one of the last Firefox updates. I have placed several bookmark folders and bookmarks in the Firefox toolbar that displays the address bar and menu as well. This is actually the only toolbar that is displayed in my version of Firefox unless you count the tabbar as a toolbar as well. The bookmark folders were displayed on the right end of the toolbar before the problem started, and started to disappear beyond that after the update.
The bookmark folders and bookmarks were auto-collapsed and only a down arrow was shown at the right end of the toolbar that could be clicked on to access all the bookmarks that were placed in the Firefox toolbar.
The bookmarks would sometimes appear and shortly thereafter disappear again but were auto-collapsed for the majority of time. This changed once I discovered that it was an unfixed bug in the Firefox web browser that was causing the auto-collapsing. An add-on was published shortly thereafter that fixed the bug. After installing the add-on the bookmark folders would again appear on the toolbar and not auto-collapsed on the right side of it.
Users who experience a similar problem can install the add-on which will take care of the bug immediately. The bug fix is provided by the same developer who also created an add-on to disable the new tab tearing feature in Firefox that could accidentally create new browser windows.
Update: Mozilla in the meantime has fixed the issue in all current versions of the Firefox web browser. The add-on is no longer required, and I have removed it from this article as a consequence to avoid the installation of it on user systems.
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