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You misunderstood. No plugins are needed.
The GTK-backend is a webserver and runs on a 'server' and you connect with the browser like any other website.
The GTK-backend generated a slightly more optimized VNC-like stream of pixels (as far as I could see).
So again, no plugins are needed. It works with IE10+ and pretty much all other modern desktop and mobile browsers in the near by future.
The only reason it doesn't work in IE9+ and other last year browsers is because the used to be security problems with the new websocket protocol. Edited 2011-10-16 20:30 UTC