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|March 22, 2011|[https://blog.mozilla.org/blog/2011/03/22/mozilla-launches-firefox-4-and-delivers-a-fast-sleek-and-customizable-browsing-experience-to-more-than-400-million-users-worldwide-2/ Firefox 4 launches and Mozilla starts move to a rapid release model with new versions every few weeks]|[[File:2011 happysnappy shirt.jpg|thumb|Firefox 4 'Happy and Snappy' t-shirt]]
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