I often play video content on my second screen, and I've noticed that when the fullscreen application loses focus (i.e. I go back to doing something on my main screen) a global menu bar appears above it. I find that distracting -- is there some way to prevent the menu bar from appearing in that context?
Install CompizConfig Settings Manager if you don't have it installed in your system.
To do that, either click the link or open a Terminal (Ctrl+Alt+T) and run:
Then open CompizConfig Settings Manager (by running the