Allows you to move your mouse over a folder on the Bookmarks Toolbar to open it immediately. This prevents you from needing to click each time, saving valuable time and effort!
As of version 1.1, you can customize the extension by going to Tools -> Add-ons -> Extensions -> Mouseover Bookmarks Toolbar -> Options.
You are able to set delay times for how quickly the folders on the bookmarks bar will open and close. You can also prevent folders from opening when you move your mouse in a certain direction.