Dear Support, I am commonly using Firefox to print files with unusual formats as Firefox is so good at interpolating these. Recently I needed to print some old CAD files in *.svg format. Firefox (as usual) was happy with this. Using 100% print scale with my printer produced an almost perfect 1:1 scale result. But it was 0.4% too large. My HP printer drivers have no scale function, nor my Cannon drivers, Hence; please could you explain how to get 0.1% control over the print scale in Firefox, rather than the default 1% control? Best regards - Mark.