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Here's how that can be done easily. Right-click on the Taskbar (ensure that Lock the Taskbar is deselected) and select Toolbars > Address. When the Address box shows up on your Toolbar, click and hold on the word Address and drag it to the top of the Desktop. Right-click on it and select Always on Top.
Now, when you maximize applications, they'll expand between your Address bar at the top and you Taskbar at the bottom.