Firefox always in task manager - it doesn't always close the program since the new update

Since I got the new Firefox 29.0.1 - when I want to reopen Firefox, I constantly have to go into the Task Manager and shut down the process before it will let me in.
I haven't had any Windows updates nor updated/added any new software on my PC since the Firefox update. So I know it has to be Firefox that's causing this bug.
A screenshot of my PC's System Task Manager after I closed Firefox:
http://www.tyacke.net/firefox 29.0.1.jpg

Found the screen shot; http://www.tyacke.net/firefox/29.0.1.jpg
Your '''\''' in the original address should be a '''/'''.
I don't see Firefox listed.
=====================================
From what I have been reading from other posts on this forum, the issue may
be caused by the clear history settings.
Press the '''<Alt Key>''' to bring up the tool bar. Then '''Tools > Options > Privacy'''.
The button next to '''History''', select '''Use Custom Settings'''.
At the bottom of the page, turn on '''Clear History When Firefox Closes.'''
At the far right, press the '''Settings''' button. Turn on ONLY '''Cache''' and
'''Form And Search History''' leaving the others off.

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