I updated firefox and I get the error message update failed as another version of firefox is running. But there is no other version of firefox running at least that I know of. Then when I try to start firefox I must restart my computer

Question

I updated firefox

Answer 1

I can't tell what system you are on, the problem mainly affects Windows users but has been known to affect Linux and even Mac users occasionally.
The only '''proper way to exit Firefox''' is to use '''Exit''' through the
File menu, not the "X" in the upper right corner of last Firefox window.
In the Firefox 4 and 5 that would be Alt+F then X, or "Firefox"button then X (Exit)
* '''Firefox hangs''' | Troubleshooting | Firefox Support <br>http://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
More Information:
'''Plug-in and tasks started by Firefox may continue after attempting
to close Firefox''' The "X" in the upper right-hand corner closes the
Window (same as Ctrl+Shift+W) but even if it is the last Firefox window,
it does not necessarily close Firefox .
The only '''proper way to exit Firefox''' is to use '''Exit''' through the
File menu, not the "X" in the upper right corner of last Firefox window.
In the Firefox 4 and 5 that would be Alt+F then X, or "Firefox"button then X (Exit)
* '''Firefox hangs''' | Troubleshooting | Firefox Support <br>http://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
Use the '''Windows Task Manger''' to remove all running firefox.exe in the "'''Processes'''" tab of the Windows Task Manager, then restart Firefox.
''very infrequent --'' If Firefox will still not start, remove the parent.lock file from the profile which is created each time Firefox is started to prevent other Firefox tasks from running, see<br>
http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file
'''Avoiding Problems with close/restart''' ''choose either extension''
:Use to close and restart Firefox after enabling or disabling an extension, switching to a new theme, or modifying configuration files, then you don't have to worry about delay or have to look in the Task Manager to see if Firefox is closed yet.
*"'''Restartless Restart'''" extension for Firefox 4.0+ only (2 KB download ) --
uses keyboard shortcut "'''Ctrl+Alt+R'''" or a file menu option.
<br>https://addons.mozilla.org/firefox/addon/249342/
*"'''QuickRestart'''" extension (34 KB download) ''(older extension for those below 4.0)''<br>
uses keyboard shortcut "'''Ctrl+Alt+R'''" or a file menu option. <br>https://addons.mozilla.org/firefox/addon/3559/