Firefox 3.5.11 was released on July 20. See complete Release Notes for full details. Auto-updates should be occurring in the next 24-48 hours, otherwise users may get the latest update by going to Help menu and selecting Check For Updates. Also, a reminder from Mozilla Developer Network, If you’re still using Firefox 3.0.x, this version is no longer supported and may contain security vulnerabilities. Please upgrade to Firefox 3.5 by downloading Firefox 3.5.11 from here

Mozilla has released the fifth (there was no Firefox 3.6.1 or 3.6.5) update for Firefox 3.6.7 on July 20. This update included 126 bug fixes, this release patches 14 security vulnerabilities, 8 labeled as critical. Users should be prompted soon to update, but can obtain this update via Help the Menu and selecting Check For Updates…For complete list of changes and more information, please see the Firefox 3.6.7 Release Notes. Source: Mozilla Links

Mozilla Messaging has release the sixth update for Thunderbird 3.0 on July 20th. The new Thunderbird 3.0.6 update includes several security and stability updates [Thunderbird release notes]. Thunderbird 2.0 and older users should upgrade by downloading Thunderbird 3.0.6 directly here. Thunderbird 3.0.5 users should be prompted to update within the next 48-hours or can do so manually via Help >> Check For Updates… Source: Mozilla Developers News

Mozilla Messaging has release the first update for Thunderbird 3.1 based on the Gecko 1.9.2 platform. For more information and to download please see the Thunderbird 3.1.1 Release Notes. Source: Mozilla Developer’s News