Firefox OS (nightly images) from FreeXperia Team is now available for download for Xperia Z3, Xperia Z3 Compact, Xperia Z2, and Xperia Z1, etc. Firefox OS is still in developing stage so do not test it on your main device.
[ VIDEO ] Xperia Z3 running Firefox OS
Check out the video below showing Xperia Z3 running Firefox OS.
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