10. Souped-up Add-ons manager

9. More intuitive interface overall

8. Stronger phishing and malware protection

7. Improved download manager

6. Native looks for every system

5. Streamlined "Remember password" handling

4. Smart bookmarks

3. Places Organizer replaces the Bookmark Manager

2. Smart Location Bar learns how you browse

1. Insanely improved performance

via lifehacker