SVG: Firefox text rendering

I was working on getting some consistency between IE and Firefox when viewing one of the Atlas SVG maps being developed and ran across an odd problem in Firefox 1.5.0.1. There appears to be some kind of hard limit on the minimum size that can be assigned to a font via CSS. I haven't done full testing so it's hard to describe the exact nature of the problem. However, as I was working on the map Firefox would not go smaller than 10px. To get around the problem I had to increase the size of the map (in Illustrator source) so that I could size the text appropriately.