Heads up! Safari 5.1.4 is now available for immediate download.

The update, measuring 46.4 MB in size, is available for OS X Lion and Snow Leopard. Windows users can also get the update. What's new? According to Apple:

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: http://support.apple.com/kb/HT5142

For detailed information on the security content of this update, please visit this site: http://support.apple.com/kb/HT1222

This article was originally published on Tuaw.