Mozilla is now recommending that people upgrade to the latest version of Firefox, 1.0.4. This new version of the popular internet browser addresses flaws that were found by security experts Secunia, which were dubbed as "extremely critical."

Secunia said they were "extremely critical" because they could have let cookie and history information be used to get access to personal information or access previously visited sites.

The first flaw reported fooled the browser into thinking software was being installed by a legitimate, or safe, website. The second happened was related to the software installation trigger which was not able to properly check icon web addresses which contain JavaScript code.

Potentially, a hacker could have taken advantage of the security flaws to secretly launch malicious code or programs.