Apple has released Safari 7.0.4 for users of OS X 10.9 Mavericks and Safari 6.1.4 for users of 10.8 Mountain Lion and 10.7 Lion, both of which fix multiple critical vulnerabilities associated with WebKit. According to the security note for these updates, both versions of Safari fix a swath of memory corruption issues within the rendering engine that could lead to arbitrary code execution after visiting a maliciously crafted Web site. They also deal with a problem with handling Unicode characters in URLs that could enable a maliciously crafted URL to send out an incorrect postMessage origin. Both updates are available only through Software Update. (Free, 10.9+/10.7–10.8)
Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
Safari 7.0.4 and 6.1.4
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Special thanks to Maarten Pullen, Alexandra L Cohn, Michael Mahoney,
and Laura Kirsch for their generous support!