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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.
The HTML was not the problem, the never finished OS was one yes.
I still liked it because of how easy it was to develop apps for it like I did with my https://jeena.net/feedmonkey
Indeed, there were advantages when It came to app development. There was for example, the Unity web exporter. Embedding web apps for the OS worked out of the box. On the flip side, there was an impact on performance. Like there was no multithreading possible. At least not for the Unity Web export.