Mozilla has released a substantial security update to the popular Web browser Firefox. While release notes are terse, saying only that the update fixes "several stability/security issues", the bug list indicates several critical vulnerabilities have been addressed, including three that could be exploited to crash the browser and run arbitrary code. (Free, 17.6 MB)
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Constant Dictionary Definitions
If you hold down Command-Control-D in a Cocoa-based application that supports AppleSpell, you'll see little dictionary pop-ups for each word that you mouse over. Neat, eh?