One easy way to reproduce this (or something very similar) is to left-click on 
anything draggable (image, tab etc) but BEFORE releasing the left mouse button, 
press the right one THEN drag. The cursor takes the "No" form and is unusable 
for the whole desktop until you kill Firefox.
The above is something I do often when I almost click on the wrong thing, and 
in previous Firefox versions the left-click was getting cancelled.

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https://bugs.launchpad.net/bugs/1012257

Title:
  Firefox 13 takes control over the mouse pointer when bookmarks are
  dragged on xubuntu 12.04

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