Fixed: 323934 - [Mac] Change default toolkit on Mac to cairo-cocoa.
Mac is the last major platform to switch to using Cairo for graphics. Now that all major platforms are using Cairo, it is possible to make changes to Gecko that rely on the use of Cairo. For example, it is now possible to fix the use of units in Gecko, which will in turn make it possible to implement full page zoom. Because so much cross-platform Gecko work depended on getting Cairo turned on on Mac, the switch may have been rushed, leading to more regressions than is usual for a large change.
Firefox 3.0, I can't wait.