I tried the NVIDIA-Solaris-x86-1.0-9625 beta driver this morning. Shortly after installing and rebooting, I poked around the nice control panel, changed my monitor resolution once or twice in it, then launched mozilla. Within 5 minutes or so my system froze.
I don't know if using a browser seems to provoke a crash moreso than just my xterms/gnome-terminals, or if more often than not I have a browser open so it's just a coincidence that mozilla or firefox are running when the host freezes.
Nonetheless, attached is a gzipped bug report. nvidia-kothbiro-bug-report.log-9625beta.gz