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Firefox 23.0 canonical 1.0 already running not shutting down or starting up error. States its already running need to shut-down do system restart and close browser.

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ok.. Open your terminal and run this command sudo pkill firefox. Then try to run firefox again.. –  Saurav Kumar Aug 31 '13 at 16:27
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+1, and just pkill firefox should do. –  mikewhatever Aug 31 '13 at 16:35

2 Answers 2

If you like the UI route:
1. Click the Ubuntu Logo
2. Type "System Monitor"
3. Find Firefox in the list of running applications, right-click and choose to kill the application

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Go to command line:

  • Run this command: $ top

  • you'll see some graphical output, then note the processID (PID) of firefox

  • then press 'k' to KILL the process
  • you'll be asked to enter the processID (PID) of process you want to kill.
  • Just enter the processID of the firefox, and you're ready to go ..!!

And you can use this procedure to kill any process.

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