SillyDog701

[Antony]

According to this Mozilla blog post, there will be a minor update for Firefox 5 available soon. The update will provide no additional features, but to resolve the incompatibility of Firefox 5 itself on upcoming OS X Lion, the next major Mac OS X operating system.

Mozilla blames the issue on web fonts (downloadable fonts) on OS X Lion, and they would use new set of API which seem to address the issue on OS X Lion

UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.19) Gecko/20110707 AlexaToolbar/alxf-2.13 Firefox/3.6.19