I had a Firefox OS phone for hobby development. The initial release wasn't amazing, but 2.0 was actually surprisingly smooth and snappy on the anemic-even-for-the-time hardware!
Great little device, genuinely.
EDIT: It was a ZTE Open
Great little device, genuinely.
EDIT: It was a ZTE Open
I have to check if I still have it around...
One funny detail I noticed recently was that its battery was made by BYD, back then an unremarkable brand. So its operating system stalled, but at least the maker of another component became immensely successful since then.
Though I am very unhappy to see that its bounce-and-stretch animation at the end of scrolling is appearing everywhere :/ It was uncomfortable and weird looking then, and it still is now.