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Google advertises Chrome as a lightweight, speedy browser and uses it as a base for its operating system, Chrome OS. The first portable machines based on the OS -- Chromebooks -- arrived on the market in June 2011.
Once a breath of fresh air on the browser market, Firefox has been losing users globally in 2011 -- at least according to Statcounter's numbers. Mozilla's open source browser recently sped up its upgrade pace, having released two major versions of the browser -- Firefox 4 and Firefox 5 -- within a three months' span.