Mozilla Firefox has been updated to v3.6.3. This release fixes a critical security issue according to Mozilla Foundation Security Advisory 2010-25:

Title: Re-use of freed object due to scope confusion
Impact: Critical
Announced: April 1, 2010
Reporter: Nils (MWR InfoSecurity)
Products: Firefox

Fixed in: Firefox 3.6.3

Description:

A memory corruption flaw leading to code execution was reported by security researcher Nils of MWR InfoSecurity during the 2010 Pwn2Own contest sponsored by TippingPoint’s Zero Day Initiative. By moving DOM nodes between documents Nils found a case where the moved node incorrectly retained its old scope. If garbage collection could be triggered at the right time then Firefox would later use this freed object.

You can update your version through Firefox’s internal updater by opening Firefox and selecting Help > Check for Updates. You can also get the full download here.

Our favorite internet browser, Firefox , has been updated today to v3.0.9.  You can update your version of Firefox by opening Firefox and selecting Help > Check for Updates.  Several security and stability issues have been patched in this latest version.

This update includes:

• Fixed several security issues.
• Fixed several stability issues.
• Many users experienced an issue where a corrupt local database caused Firefox to “lose” its stored cookies. (bug 470578)
• Fixed an issue where, starting with Firefox 3.0.7, inline image attachments on popular webmail services (like AOL and AIM) would not display. (bug 482659)
• Large forms would sometimes take a long time to submit. (bug 426991)
• In certain cases, new windows would not have proper focus. (bug 446568)