Mozilla is rolling out a security release today for Firefox 3, bringing the current stable version to 3.0.8.
Most users are already seeing an automatic updates this morning but if you aren't, just click 'Help' at the top of the browser then 'Check for Updates'.
This latest update addresses two security issues (with more information on the Mozilla blog here).
Earlier this month Mozilla released a public beta of the next major version of Firefox labeled 3.1 Beta 3.
When released, the version number is expected to jump to Firefox 3.5 representing a significant upgrade. Beta testers can still try the upcoming Firefox. The beta is here.
The full download for the current 'stable' version of Firefox 3 is here.