There could be a case when the browser in which you are working on gets freezes and then you keep waiting so that it restarts automatically after this crash. So that you can start using it, however you can quickly kill these browser in freeze state through task manager in windows by killing the browser process under the processes tab.
But if you are not aware about how to use windows in built task manager, here is a simple easy to use batch script which allows you to restart the browser in freeze state easily.
Restart Browser is a simple, handy utility designed to enable you to restart your browser if it freezes or crashes. This is simply a batch file which will ask you which browser, you just need to specify the browser letter at the command prompt to restart it after it gets hanged.