Although critics argued that ads violated Mozilla's stated mission of putting users before profits, the company defended the move and said it would press forward.
Some users on MozillaZine speculated that the new tab page redesign hinted that Mozilla was laying the ground for its advertisements, a not unreasonable assumption. In May, when Mozilla defended the decision and promised that Firefox would not become "a mess of logos sold to the highest bidder," Johnathan Nightingale, the executive who heads development of Firefox, added, "We will experiment ... we will mess with the layout," to better understand what would and wouldn't work.
Firefox 31 can be downloaded for Windows, OS X and Linux from Mozilla's website.
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