Mozilla has released the 19th and final stability and security update for the Firefox 3 browser. For more information about What’s New in Firefox 3.0.19, check out the Firefox 3.0.19 Release Notes. Current Firefox 3 users may obtain Firefox 3.0.19 manually via the Check for Updates… option from the Help menu. Automatic upgrade (for those who have this feature enabled) should occur within the next 24-48 hours. Alternatively, users may also download Firefox 3.0.19 directly via getfirefox.com IMPORTANT: Firefox 3.0 is no longer supported, users should upgrade to Firefox 3.5 or 3.6 for continued support.

Firefox 3.5.9 was released on March 30th. 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 3.5.9 from www.firefox.com.

Mozilla Messaging has release the fourth update for Thunderbird 3.0. The new Thunderbird 3.0.4 update includes several security and stability updates [Thunderbird release notes]. Thunderbird 2.0 and older users should upgrade by downloading Thunderbird 3.0.4 directly via http://getthunderbird.com. Thunderbird 3.0 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