Is there a way to change the speed unit used by Firefox when downloading?

Currently, when I download a file, the progress is shown in kilobytes per second. I would like to have that shown as megabits per second, so I can stop wasting time looking up a speed conversion calculator and finding out how the download is doing as compared to what my ISP says my connection is worth. Or, to compare the download speed to any of the speed tests I have done