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0e1f616
(Get the code!)
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.