Apple has released a new version of Safari 5.1.2 with many bugs fixed and improved stability. This new version is much stable as compared to the earlier version, low memory consumption and allows readers to read PDF files just in the web contents.
This update contains various improvements, including fixes that:
Address issues that could cause hangs and excessive memory usage
Address issues that could cause webpages to flash white
Allow PDFs to be displayed within web content
Download Safari 5.1.2 for Windows or Mac