Mozilla is warning users to upgrade to the latest version released last week as it fixes 21 securitly vulnerabilities in the browser.
The Article wrote: The Computer Emergency Readiness Team (CERT) warned on Monday that earlier versions of Firefox, and other Mozilla software based on Firefox code, contain a clutch of vulnerabilities that expose users to attack.
The Mozilla Foundation released a new version of Firefox last week, version 1.5.0.2, which it said contained fixes for several security flaws.
According to security firm Secunia, there are a total of 21 flaws in the older versions of Firefox, such as Firefox 1.5, some of which it described as critical.

