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IE has had it wrong with progressive jpgs ever since it started supporting the file format. Instead of rendering these images progressively as intended, the whole file had to be downloaded and then appears all at once. On a slow dial-up this makes progressives slower than standard jpg, defeating one of the main purposes behind using pogressive.
I never noticed a quality issue on this, just a download issue.
To my eyes there is more detail in the firefox image when the browsers scale the image to fit on the page.
When it's viewed at actual size theres little or no difference.
As I'm using a laptop I'm assuming Firefox must scale the images closer to the natural resolution of my display.