Message: "Please quit the following Internet browsers before installing this software..." when I install Norton AntiVirus 12 or Norton Internet Security 5 on my Mac

To fix this problem, exit your browser window if it is open, and continue with the installation of your Norton product. If the problem persists, end the browser-related process.

Force close the browser-related process

  1. Go to the Terminal window.

  2. In the Terminal window, depending on your browser, type one of the following commands, and then press return:

    • For Safari:

      ps - ef | grep - i safari

    • For Firefox:

      ps - ef | grep - i firefox

    Make a note of the PID for the browser-related process.

  3. In the Terminal window, type the following command, and then press return:

    sudo kill -9 PID

    Where PID is the process ID for the browser-related process.

  4. Type your Administrator account user name and password, and then press return.

  5. Install your Norton product.

Thank you!

Thank you for using Norton Support.

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DOCID: v66344559_EndUserProfile_en_us
Operating System: Mac OS X
Last modified: 10/23/2015