Hi,
The underlying API, that handle images in mozilla and thus FireFox and Camino might switch from quickdraw to the new graphics API introduced with Mac OS X: Quartz. To have such switch happen mozilla needs to be tested with the new code. More information can be retrieved in bug 245407. What you can do to help is download this special nightly http://ftp.mozilla.org/pub/mozilla.org/mozilla/nightly/2004-08-06-13-test-245407/mozilla-mac-MachO.dmg.gz that is quartz native and use it. If you encounter bugs, crahes etc ... File a bug at http://bugzilla.mozilla.org stating that you where using that special build, and add to your bug's cc list jhpedemonte@gmail.com so he can track bugs.