I'm a little bemused.

I can see that Times New Roman 16 is listed as being the default FF font, but I see things in Tahoma - because there's a check box in the Advance settings that allows a web page to use its own fonts. (Uncheck it and sure enough everything goes TNR).

Similarly I can see the normal font setting in Opera as being (TNR 16), but I still see things in Tahoma, although I cannot find a setting/check box that allows the page to do this. Changing the TNR font doesn't appear to do anything.