This problem is not with Firefox only. It can be with any window. This is a 
possible duplicate with this one:
https://bugs.launchpad.net/ubuntu/+bug/1171451

The freeze happens to the last window that is to be minimized. For
example if you have 2 open apps. If you minimize the first one, no
freeze will occur. But when you minimize the second one the freeze will
occur.

When I switch to another workspace and then come back, the freeze is
gone.

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https://bugs.launchpad.net/bugs/1163503

Title:
  Minimizing firefox makes unity freeze

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