I checked the software design requirements. Unfortunately, they do not support other browsers such as Chrome, Opera, or Firefox for Mac.
Seems they are more Windows user friendly. It does indicate that they support Lion and Mountain Lion. If you upgraded to Mountain Lion, (Lion is no longer available from the App Store), it most likely installs the lastest version of Safari being 6.0.4 which isn't supported either.
Supported Systems and Browsers:
Windows XP
Internet Explorer 8
Firefox 15.0-17.0
Chrome 20-24
Windows Vista
Internet Explorer 8, 9
Firefox 15.0-17.0
Chrome 20-24
Windows 7
Internet Explorer 8, 9
Firefox 15.0-17.0
Chrome 20 - 24
Mac OS 10.6.8 Snow Leopard
Safari 5.1.7
Mac OS 10.7.5 Lion and Mac OS 10.8.2 Mountain Lion
Safari 6.0.2
Does NOT support Internet Explorer 8 - 64-bit on Windows 7
Player might work in newer browsers