Further to marmistrz's link, here's my repo. It's a few commits ahead, a bit of clean up, some refactoring and beginnings of bookmark support. The aim was going to be to track as much cpp code from sailfish-browser as possible so I only really had UI code to work on. I didn't want to start working on qt5 until the xcb workaround was properly solved and more projects were working with it.
https://github.com/android-808/microbe

Qt Quick Controls can be themed, like what is done at the moment for Desktop in qt5.3 and Android and iOS in qt5.4.
https://qt.gitorious.org/qt/qtquickc...ontrols/Styles


qt-components-hildon could be used as a reference for the theme. This was something I'd been toying with for Jessie. Ditch as much QtMaemo5 stuff as possible and externalize the remaining module like libqt5x11extras5 so I could use stock Debian qt5.

Qt5/GTK3/general outdated libs are a real annoyance to me.

With regards to gtk2, I don't see why there wouldn't be a way. At the end of the day qtmozembed only acts as a simplified wrapper around existing functions within embedlite. Can we not just track down the last version of gtkmozembed and see what needs adapting to work with recent embedlite/gecko. I would rather use embedlite because IIRC it works on a similar design to the changes used in microb.