Why does a clicked on application not move to the foreground?

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http://askubuntu.com – I'm running into issues where if I have two applications running, where one is smaller and in the foreground, and I click on the window in the background, it does not move into the foreground. For example, if I have a terminal window on top of Firefox, and I click on the webpage in the background, Firefox gains focus but the terminal is still visible on top of Firefox. Is there a way to change this setting so that clicked on applications are always on top? Note: If I click on the title bar, the application does in fact move to the top (in front of the terminal for instance). (HowTos)