Firefox 3.6.2 is released and is already available through the automatic update option in the web browser. You can also download it separately from the official page of Mozilla.
The Mozilla developers have initially planned to release Firefox 3.6.2 security update on March 30, but apparently they changed their decision and released the update earlier.
Many bugs have been fixed in Firefox 3.6.2, out of which 21 have been classified as critical by the Mozilla developers. But before updating to the latest version of Firefox browser, be sure to look at the known issues section in the release notes, so that you do not run into trouble.