This is not true. I work on Firefox Sync full time, as do multiple other engineers. Admittedly, the current version in Desktop/iOS/Android is in a sort of 'mai

This is not true. I work on Firefox Sync full time, as do multiple other engineers. Admittedly, the current version in Desktop/iOS/Android is in a sort of 'maintenance mode' (we still fix bugs, but don't work on new features or actively fix it up). The reason for this is basically that those three versions are entirely separate implementations that share no code (they're also in languages that have integration difficulties on the other platforms, unfortunately, so we can't just settle on one). We're currently rewriting it as a cross-platform module, and planning on replacing them.