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While Google and Yahoo do not provide user friendly results for their services if TOR is used, Bing is an exception. Bing does not show any error like Yahoo or ask for capacha verification like Google while using TOR.
However, when it comes to DDG, not even Bing can match it. This is because of the unique and anonymity features of DDG. If you use DDG through TOR using latest version of Firefox, your privacy is assured to a great extent. Google, Yahoo and Bing fail on this front.
However, some additional steps must be taken by users to get a stronger anonymity. They must manage their plugins and addons and must ensure that their information is not leaked by them. Take special care of java and java scripts through NoScript along with a Firefox browser.
Use DDG and have a safe, secure and private browsing experience.