After installing the update and rebooting, I wasnt able to launch Firefox or Safari without it crashing. I then logged into my Admin account and Firefox & Safari worked. I tried repairing permissions, didnt help. I then restarted the computer and everything is working fine now.
So, if anyone has any trouble, restart (2) times after the update.
I had the same problem, but it went past Firefox and Safari. After those crashed on me I tried TextEdit and Dictionary, and they crashed too. Everything I tried to open crashed. Thankfully a reboot fixed it. . .
. . . for now.