There&#x27;s a lot more to being a browser -- and being Firefox -- than the web rendering engine. We&#x27;re able to deliver the kinds of Sync features, private browsing, and so on that we think are important.<p>(I work on Firefox for Android and iOS, and even _I_ don&#x27;t really care which rendering engine it uses. I care that I can trust it, that the UX is excellent, and that I have my data.)