Safari 5.1.4 contains improvements to performance, stability, compatibility, and security, including changes that:
• Improve JavaScript performance
• Improve responsiveness when typing into the search field after changing network configurations or with an intermittent network connection
• Address an issue that could cause webpages to flash white when switching between Safari windows
• Address issues that prevented printing U.S. Postal Service shipping labels and embedded PDFs
• Preserve links in PDFs saved from webpages
• Fix an issue that could make Flash content appear incomplete after using gesture zooming
• Fix an issue that could cause the screen to dim while watching HTML5 video
• Improve stability, compatibility and startup time when using extensions
• Allow cookies set during regular browsing to be available after using Private Browsing
• Fix an issue that could cause some data to be left behind after pressing the “Remove All Website Data” button
For detailed information on this update, please visit this site: About Safari 5.1.4 for OS X Lion
For detailed information on the security content of this update, please visit this site: Apple security updates