If you use multiple monitors, you'll probably want to on one monitor was, always on top any window (eg browser).
There are programs that can be set so that the program was always on top, but they all sucks, when you press the Show Desktop (WIN + D).
But there is a way, we will need two programs.
1. Actual Multiple Monitors (I use version 8.0.3 ) - Test for 30 days, then pay $ 30, or you are a good hunter in google and you will find what you think. Download
2. MurGeeMon (do not know what version ) - free. Download
Install the two programs.
After installation Actual Multiple Monitors, just run it, nothing we have to do. If it works, the extended monitor should we also show the bottom bar of the time, start menu and show the desktop.
After installation MurGeeMon, the tray icon appears, click on it, right-click choose Window Management -> Always On Top Maker. A new window appears , select a running program, in my case it will be Firefox and click Make Selected Window Always On Top. Then, you can hide the window to tray.
That's all. You can use the Windows Key + D, show the desktop, on the main monitor, and even extended, and your browser will always on top.
Tested on Windows 7.