Mozilla pushed Firefox 3.5.3 to servers this afternoon, fixing several security and stability issues. There's nothing terribly exciting in this release, but it's always good to make sure you're using the most stable and secure release, so go to Help -> Check for Updates to upgrade to 3.5.3. If you're really curious, check out the full changelog here.
[Mozilla Firefox 3.5.3 Release Notes]
Mozilla Releases Firefox 3.5.3 with Security and Stability Fixes - Firefox 3.5.3 - Lifehacker
