Researchers successfully demonstrated new security vulnerabilities in all three browsers tested Firefox, Chrome and IE. Mozilla has rolled out a new version of Firefox that includes fixes for security vulnerabilities used in the contest, and Google has done the same with Chrome. Google Chrome 25 now includes a fix for a high-risk type confusion vulnerability in WebKit. Mozilla fixed a critical user-after-free vulnerability in the HTML editor in Firefox that had been used in Pwn2Own competition. The team from VUPEN successfully compromised Firefox.
Source: https://threatpost.com/mozilla-and-google-patch-browser-flaws-used-pwn2own-030813/77606/