From Marc Dillon himself and from Jolla employes on IRC. A Jolla employe said it in that DNA hangout. It's based on IPCLite API (embedlite). Just like QmlMozBrowser or MeeFox. But they do of course their own UI. So yes, it's kinda a Firefox like MicroB on N900 was kinda a Firefox. Why are you pissed? I'm glad it's Gecko.