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Today 10 years ago I got a Firefox OS phone
(jemmy.jeena.net)
This is a most excellent place for technology news and articles.
Fxos was just android + a custom launcher, it was not a huge investment since it was just a launcher in the end. They focused on low prices, a camera to create video reports and a usable mobile browser.
This is incorrect, it was also Linux-based but completely unrelated to Android.
It was android 5 (or maybe 6 with its 2.6 versione) and the launcher was gaia