The parser. Once for properly parsing HTML content, for a search engine, and the other for a framework used for saving pages (For an Instapaper like service). So it wasn't a big deal, but in both cases, a DOM was constructed and operations were executed against the DOM.

Nothing about that or the JS engine is impressive really. That was my point, more or less. Of course, there's a difference between building something that works, and something that works exceptionally works etc etc(all the stuff on top of that), but all told, I still don't think building a browser justifies assembling such a huge org, even if there is no reliance on third-party technologies.