It is not limited to sprites. Try this ancient test page with Firebug:
http://koti.mbnet.fi/ojalesa/exam/myriad.html

Marker icon image, shadow and transparent are requested for every
individual marker.

If I boot my XP computer and run only FF3.5, the image cache works
fine. When I start any other application (another browser or code
editor) the cache stops working. Mysterious.
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