I haven't read the entire thread, so sorry if something I'm commenting has been said.
From a technical standpoint, webOS and Firefox OS are like oil and water. Yes, both are liquids, but...
FirefoxOS is, literally, Gecko on top of Linux, while webOS has a much more sophisticated design.
Enyo2 apps can run on FirefoxOS? yes, with some updates in Enyo (Remember FirefoxOS isn't available). That's all: no background services, no system manager calls, no built in database support...
I could go into more detail, but basically trying to put together FirefoxOS and webOS isn't feasible without severely hurting at least one of both concepts.