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I could not restart firefox after I closed the window of brower's.

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Sometimes I could not restart the firefox after I close it, the warning reads "The firefox is already running, but it is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."

It's quite bothering that I have to terminate the process to start it again.

Sometimes I could not restart the firefox after I close it, the warning reads "The firefox is already running, but it is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." It's quite bothering that I have to terminate the process to start it again.

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See "Firefox is already running but is not responding" error - How to fix, in your case it appears to be caused by Firefox hanging when it closes, for more details on that see hang at exit.

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Your plugins list shows outdated plugin(s) with known security and stability risks.

  • Java Plug-in 1.6.0_13 for Netscape Navigator (DLL Helper)

Update the Java plugin to the latest version.