It works on Firefox and IE, but does require an Amazon account to make all the features work.
The anticipated add-on, along with similar tools already included in the Mozilla Firefox and Microsoft IE 9 browsers, leaves Google Chrome as the only major browser provider not to offer a do-not-track feature.
So instead of getting IE bundled with the OS they were offered IE, Firefox, Opera and so on and were thus not locked in in any manner.
When you look at the past year you see trends that show a significant shift: IE and Firefox are losing market share while Chrome and Safari are gaining Chrome in particular has almost doubled its market share in the past 11 months, from 4.6% in December 2009 to 8.5% in October 2010.
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"It's still very much the case that Firefox is way ahead of IE when it comes to standard compliance, " he said.
The service is supported on iOS, Chrome, IE 9, Firefox, Safari, Opera and Roku devices, though those geographic restrictions keep the access pool quite limited.
As Google rose to dominate the web during this decade, it therefore invested a lot of energy into a rival web browser to IE, called Firefox.
Thus Firefox rose to become the largest browser after IE, with almost 20% of the market.
IE's share dropped to 92 percent when Firefox was launched but this was now back to 97 percent, Weeks said.
Latest statistics, from measurement firm NetApplications, show that IE has 59.9% of the market, with Firefox gaining on it, with 24.5%.
In the UK, research firm Nielsen suggests that IE still commands 70% of the market, with Mozilla's Firefox on 18%.
Mozilla says its latest version of open-sourced Firefox was downloaded 7.1 million times, while Microsoft reported last week that IE 9 was downloaded 2.35 million times.
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