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If it's based on FireFox than it can't be 100% pure Swing, so the title is misleading.

Most Swing components are lightweight, that means that they are not native. The only Heavyweight component with native resources is the Window other Swing components are drawn into. Other java browsers(other than the JEditorPane but can we call this a browser?) were native heavyweight components and you had to take some precaution before adding them to your GUI, like for exemple making your menu and tooltips heavyweight if you did not you would have some repaint problems as the browser would always be before your menu and hide them.
This one is lightweight that makes him a 100% pure swing component.

demetrios, as Thierry noted WebRenderer Swing Edition is a lightweight Swing component.

Before making assertions why not just download WebRenderer Swing Edition and try it for yourself? It is 100% lightweight Swing. All drawing is Swing (yes Swing g.drawString etc) and no native components are utilized in the drawing/rendering with the exception of third party plugins such as Applets and Flash.

Being the developer of this product it is interesting to see doubt being cast. There are no tricks here. Swing performs all the rendering.

> Before making assertions why not just download WebRenderer Swing Edition and try it for yourself?
I wanted to try it a few years ago, but I couldn't: just to download a simple trial, it required just too much information from me as a user, so I gave up. I evaluated many hundreds of libraries/products, and if for each it would have been so bureaucratic like this product, than I would be already old :).
It must not be the same in this case, but from my experience, if a getting a trial is so complicated, than there's something to hide (e.g. a very very high price tag :) ).

Cool stuff. It would be nice if you had pricing on your site instead of having to contact someone first. That's a turn off.

Not sure why any developer would pay for something that soon will be free and included in the JDK.