https://bugzilla.redhat.com/show_bug.cgi?id=857860
--- Comment #5 from Paul Flo Williams paul@frixxon.co.uk --- Created attachment 613895 --> https://bugzilla.redhat.com/attachment.cgi?id=613895&action=edit Screenshot from Windows
Just out of interest, here is the rendering of Calibri in Firefox 3.6 on Windows XP with no font smoothing or ClearType. Somehow, it is getting consistent stroke widths.