Why are there 26 firefox.exe processes running when the taskbar shows none?

Win 7 professional, Firefox 25.0.1. If I shut down Firefox and restart it I often get an error that a copy is already running. Checking the Task Manager shows many firefox.exe processes (26 this morning) even though the application tab shows none.

Hello Axis,
Can you please confirm if this happens each time you are using Firefox? Also, the cache size wouldn't have a big bearing on this issue happening. Can you please try if this issue happens when you are running Firefox in safe-mode (instructions below). if it doesn't then we can narrow the issue to a plugin / addon.
<hr>
Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* On Windows you can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac you can open Firefox 4.0+ in Safe Mode by holding the '''option''' key while starting Firefox.
* On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
<hr>
Thank you.

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