'Do not track' makes waves

This week, both Internet Explorer and Firefox added "do not track" tools. Also, Google unveils anti-content farm Chrome tool and Avast gets Sandboxing.

Over the past week, both Microsoft and Mozilla got some attention for their respective browsers with new "do not track" features. For its part, Microsoft announced the release candidate of Internet Explorer 9 at the Hang Art Gallery in San Francisco's Union Square. A massive list of improvements debuted in the new RC. Among the most notable enhancements are the new ActiveX filter, expanded support for HTML5 and "future-tech" standards, and advertiser tracking protection.

Meanwhile, Firefox 4 beta 11 has landed a useful security feature for people who are sick of "stalkertizements," those cookie-based ads that use your browsing history to target ads at your perceived tastes. The new "Do Not Track" feature in Firefox 4 beta 11 sends out a header that tells Web sites that you want to opt out of behavioral tracking, though Mozilla cautions in a blog post that it will take some time for sites and advertisers to respond to the header.

In other browser news, Google unveiled anti-content farm Chrome tool, which asks the public to help identify the worst offenders. Also in Windows news this week: Flash 10.2 arrives with more efficient video and Sandboxing is coming to Avast 6.