Firefox 3.0.3 builds for Solaris/OpenSolaris are avaiable
By pengyang on Sep 27, 2008
Just uploaded the Firefox 3.0.3 contributed builds(x86/SPARC) for OpenSolaris and Solaris 10 to Mozilla server. It's a quick wrap up for the 3.0.2 release several days ago to fix a critical bug. Please check the release notes for detail.
If you've already installed contributed Firefox 3.0.x(package format) on your Solaris 10 box, you could just pkgrm SFWfirefox and reinstall only the firefox package. It should work.