The easiest way is to press the x button or press alt+F4 buttons at the same time. Another way is to press ctrl+alt+delete buttons at the same time and open the task manager. After you open the task manager, you end any process that says mozilla firefox. If that does not work, log off or restart the computer. If the problem keeps happening reinstall or repair firefox under add and remove programs in the control panel. If any of these do not work, use google chrome, opera, or even go back to internet explorer if any of the former do not work. Hope any of these tips will help.
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