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I added a note that MozMagnifyGesture and related events are chrome only. I based this on the following comment in the gecko source at browser/base/content/browser.js:985
// Simple gestures support // // As per bug #412486, web content must not be allowed to receive any // simple gesture events. Multi-touch gesture APIs are in their // infancy and we do NOT want to be forced into supporting an API that // will probably have to change in the future. (The current Mac OS X // API is undocumented and was reverse-engineered.) Until support is // implemented in the event dispatcher to keep these events as // chrome-only, we must listen for the simple gesture events during // the capturing phase and call stopPropagation on every event.