Firefox 3 is the latest and greatest version of Mozilla Firefox. It includes many new features, and fixes many known issues in Firefox 2. Here is a list of knowledge base articles that cover issues you can solve by simply upgrading to Firefox 3:

• Lost Bookmarks
• Unable to download or save files
• Gray bar below the status bar
• Toolbar keeps resetting
• High memory usage
• Troubleshooting performance issues on Intel Macs?
• Back and forward or other toolbar buttons are missing
• TypeError avg_DTFox prefs has no properties
• OCSP error when accessing secure sites
• Disabling third party cookies
• Firefox prints pages in a different layout

Upgrade to Firefox 3 to experience the difference yourself!