Japanese mobile carrier KDDI Corp. said it would start selling the first smartphones in Japan that run on the open-source Firefox operating system beginning on Thursday.

The Fx0, to be available for ¥49,680 ($412), is manufactured by LG Electronics Inc. The device will come with a 4.7-inch display and will have a transparent gold frame designed by Tokujin Yoshioka, who has worked on products from Swarovski, the crystal maker, and fashion brand Issey Miyake.

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