In the PC version (Mac, Linux and Windows), Firefox 21 delivers a slightly better ability to control the Do Not Track option, which indicates to websites whether the user wants to allow monitoring of its habits when surfing or not, and the expansion of the recently implemented Social APIs. The latter is of course designed for social networks and to ease sharing of content within a web browser, and Firefox 21, in addition to existing support for Facebook, added support for MSN Now, Cliqz, Weibo and Mixi.
Another novelty is the Firefox Health Report, which provides users with advice on fine-tuning of the browser's behaviour on their computers. In the version for Android, Firefox 21 now has a different standard font (Open Sans and Charis) which should enable more comfortable reading of the text on smartphones and tablets as well as faster access to data on the history of surfing and the ability to record multimedia files with gestures. More details about the changes are interested can look at the official website for the PC and Android version.
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