Hi Ciaran,
I did a multi test of this site on many devices with different OS and version of browsers, I describe result below:
PCs:
- Computer 1 / Win7HP / newest Firefox /[color=#ff0000] bad font[/color]
- Computer 1 / Win7HP / newest IE / [color=#ff0000]bad font[/color]
- Computer 2 / Win7Pro / newest Firefox /[color=#ff0000] bad font[/color]
- Computer 2 / Win7Pro / IE 9 / [color=#ff0000]bad font[/color]
- Computer 3 / Win7Pro / newest Firefox / [color=#ff0000]bad font[/color]
- Computer 3 / Win7Pro / newest IE / [color=#ff0000]bad font[/color]
- Computer 3 / Win7Pro / newest Chrome /[color=#008800] OK[/color]
- Computer 3 / Win7Pro / newest Chromium /[color=#008800] OK[/color]
- Computer 4 / Linux Fedora / Firefox / [color=#ff0000]bad font[/color]
- Computer 4 / Linux Fedora / Chrome / [color=#ff0000]bad font[/color]
- Computer 4 / Linux Fedora / Conqueror / [color=#008800]OK[/color]
Mobile platforms
- iPad1 / iOS / [color=#ff0000]bad font[/color]
- iPhone4 / iOS /[color=#ff0000] bad font[/color]
- GalaxyTab2 / Adnroid /[color=#008800] OK[/color]
- Nokia / WindowsPhone / [color=#ff0000]bad font[/color]
I really don't understand how do you have god result on Firefox, we have the same version, I make a clean OS install and browsers and result is the same, for sure I can install Win8.1u or test version of Win10 to check it...
Kind regards
Michał