is GNOME Yare Browser Engine refer to a definition of "Gecko is the revolutionary next-generation browser engine ..." , which is in very early stage of its development. Read MANIFESTO please.
and is a term of wind-surfing so that it respect historic convention of navigator and explorer. This is a clip presenting windsurfers on gybe.
pronounced in [ʤáib], originally. The GNOME yare browser engine, gybe is pronounced in [gáib], respecting pronounciation of GNOME GNOME Users FAQ has the answer. ,

found more on

project page by
and, if you're friendly to Korean, a set of wiki pages is prepared.

has modules of

and with help of

GStreamer and DevHelp