QuickTime prevents Firefox from erasing history

Whenever I have visited a website that uses the QuickTime plugin, I can't erase the history or any other related information (cookies, ...).
Sometimes I get this information in a pop-up:
"''QuickTime failed to initialize. Error #0.
Please make sure the QuickTime is properly installed on this computer.''"
But most of the time, it just freezes and I have to kill Firefox and two "plugin-container.exe" subprocesses whose command-line is detailed below:
"C:\Program Files (x86)\Mozilla Firefox 4.0 Beta 7\plugin-container.exe" --channel=1588.157db360.1147255996 "C:\Windows\SysWOW64\Macromed\Flash\NPSWF32.dll" "Mozilla.Firefox.4.0" -omnijar C:\Program Files (x86)\Mozilla Firefox 4.0 Beta 7\omni.jar 1588 \\.\pipe\gecko-crash-server-pipe.1588 plugin
"C:\Program Files (x86)\Mozilla Firefox 4.0 Beta 7\plugin-container.exe" --channel=1588.e935280.1744116617 "C:\Program Files (x86)\QuickTime\Plugins\npqtplugin6.dll" "Mozilla.Firefox.4.0" -omnijar C:\Program Files (x86)\Mozilla Firefox 4.0 Beta 7\omni.jar 1588 \\.\pipe\gecko-crash-server-pipe.1588 plugin
Restarting version 3.6, clearing all from there and coming back to Firefox 4 works, but it is a hassle. After that, clearing the history works again.
Also happens if launched in safe mode.

Try to exclude the cookies from Clear Recent History
*Tools > Options > Privacy : History: [X] Clear history when Firefox closes > Settings
*https://support.mozilla.org/kb/Clear+Recent+History
Try to install the latest QuickTime version.
*QuickTime 7.7.1 for Windows: http://support.apple.com/kb/DL837

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