• Automated update to streamline product upgrades. Notification of an update is more prominent, and updates to Firefox may now be half a megabyte or smaller. Updating extensions has also improved.
• Faster browser navigation with improvements to back and forward button performance.
• Drag and drop reordering for browser tabs.
• Improvements to popup blocking.
• Clear Private Data feature provides an easy way to quickly remove personal data through a menu item or keyboard shortcut.
• Answers.com is added to the search engine list.
• Improvements to product usability including descriptive error pages, redesigned options menu, RSS discovery, and "Safe Mode" experience.
• Better accessibility including support for DHTML accessibility and assistive technologies such as the Window-Eyes 5.5 beta screen reader for Microsoft Windows. Screen readers read aloud all available information in applications and documents or show the information on a Braille display, enabling blind and visually impaired users to use equivalent software functionality as their sighted peers.
• Report a broken Web site wizard to report Web sites that are not working in Firefox.
• Better support for Mac OS X (10.2 and greater) including profile migration from Safari and Mac Internet Explorer.
• New support for Web Standards including SVG, CSS 2 and CSS 3, and JavaScript 1.6.
• Many security enhancements.
• List of notable bug fixes since Firefox 1.5 Beta 2