Yes, also QtWebKit is deprecated, and that's one more reason for switch their browser to Gecko. Also, I think that Qt Company have deprecated QtWebKit too soon, giving us, developers, a rendering engine implementation that it is incomplete (QtWebKit 3.0, in Qml), and another one that it isn't 100% complete (QtWebEngine in Qt 5.4). QtWebEngine implementation is usable in Qt 5.5, but it is in beta state now.