Firefox 2 Updated

Firefox was updated on my Windows machine a little while ago. It’s version 2.0.0.1 and includes 8 security updates, five of which are listed as critical. Critical means code can be run or program’s installed with normal browsing. Here’s a list of what’s included: (http://www.mozilla.org/projects/security/known-vulnerabilities.html#firefox2.0.0.1)
The update hasn’t shown up on my Mac yet but it is for Mac and Linux in addition to Windows.