When you say the color was changed for the radio buttons - do you mean the selected state or are you just referring to the outline?
On Firefox on the mac, it uses the Mac stye buttons which don't have any additional style added to them. Also, the outlines of all the fields including radio buttons are just standard.
On my firefox in IE, it shows a green dot for the selection. This time, though, not only is the input text colored, but so is are the outlines in the form.
On Internet Explorer, the radio buttons and all fields shows the standard black outlines, the radio dot selector is also standard black, but the text in the input fields is the light blue.
It sounds like there is something amiss with a style sheet.