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speedtest.net Rated 5 out of 5 stars
Mozilla Firefox 10, 11 versions of forced underestimate the speed of data transmission. This can be seen in the screenshot http://www.speedtest.net/result/1822913913.png
Speed Upload - 11,49 Mb\s Very low
The old version of Firefox Setup 3.6.27 works well, without understating the speed, screenshot
Speed Upload - 70,13 Mb\s Very Good