Ubiquity was ppioneered by Aza Raskin (son of Jess Rasking, designer the original Mac interface). I always had the feeling that uqiquity never was a Mozilla project per say, it was more his personal project that he happened to do inside Mozilla. Perhaps he left or got promoted and the project stopped. I am only guessing.
Apologies, I wasn't trying to imply a connection between the Mac interface and Ubiquity, just wanted to put Aza's love for UX in context by mentioning his father's work. I also didn't know about Archy.
