Mozilla confirms critical vulnerability in Firefox 3.5
about:config into the browsers location bar and then set the
about:config settings, users will first see a warning message stating that "This might void your warranty" and that changes to the advanced settings can be harmful to the stability, security and performance of Firefox. To continue users must click a button marked "I'll be careful I promise!".
- First Zero Day Exploit for Firefox 3.5, a report from The H.