Firefox 3.6 doesn't support the 'triggerDialog' feature, so it relies on the file upload field correctly overlaying.
On Windows (not Mac), in some CSS contexts (I guess something to do with surrounding HTML possibly having overflows or positioning) the very large font size (999px) assigned to the button-face causes Firefox to have some kind of maths overflow and assign the button in the wrong place.
Firebug shows the button position correctly, but if you make it visible you can see it is not rendered correctly.
The fix for me was to use 50px for the font size. I guess something larger would also work, I didn't have time to experiment with different values.
Firefox 3.6 doesn't support the 'triggerDialog' feature, so it relies on the file upload field correctly overlaying.
On Windows (not Mac), in some CSS contexts (I guess something to do with surrounding HTML possibly having overflows or positioning) the very large font size (999px) assigned to the button-face causes Firefox to have some kind of maths overflow and assign the button in the wrong place.
Firebug shows the button position correctly, but if you make it visible you can see it is not rendered correctly.
The fix for me was to use 50px for the font size. I guess something larger would also work, I didn't have time to experiment with different values.