firefox black rectangle

Firefox's blackbox

Is there anyone out there who knows how to get rid of the black rectangle/black box that overlaps the stories? It happens with firefox, i've seen it on multiple machines, and have had the problem on both xp and vista.

It's not selectable, i can get to the text beneath by copy pasting it, but it detracts from an otherwise very good reading experience.

Love,
Amber

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