Receive "Firefox is already running but is not responding" in Red Hat Enterprise Linux 6.4 When Smartcard is in Use

Solution Verified - Updated -

Issue

A problem with Firefox restarting after being closed.

The error is:
"Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."

Environment

Red Hat Enterprise Linux (RHEL) 6.4

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