Mozilla has released the first maintenance build for Firefox 3.5 as promised within a week of the discovery of a security vulnerability. Suffice to say this is a recommended update.

One security issue has been addressed which is related to the new TraceMonkey engine, where a corrupt state in the JIT-compiler could be abused by malware. Other changes include stability fixes and a faster start-up for the Windows platform, due to directory scanning slowness.

As always, if you didn't get the automated message, try Help -> Check for Updates... or download the full installer from Mozilla's web site.