



one of the bugs open on bugzilla was a request for hiding bookmarks and bookmark folders from the menu, specifically for keyword bookmarks. using this code and naming the bookmarks and bookmark folders to "hidden" without the quotes will remove them from the bookmarks menu.
Note: unfortunately, in the sidebar and the tab, the entries are not accessible via css, only by the DOM, so an extension would need to be written utilizing javascript and/or xul to hide the bookmarks, both of which I am inexperienced with. Like I described initially in the long definition, this works on the bookmarks menu hence only useful for those that use it.
I definitely like the idea, but it only hides the bookmarks from the drop-down menu. The bookmarks still show when listed in a sidebar or tab (which is how I usually view them).