A method and system for monitoring events related to web browser extensions includes storing a set of events for which a browser extension integrated in a web browser application registers a listener. A conferencing session intake interface is provided to receive, at a computer, parameters defining plural conferencing sessions. Preferably, the carrier gas is brought into contact with the crystal growth surface, and the feedstock gas is brought into contact with at least a part of a region except for the crystal growth surface with which the carrier gas has been brought into contact.