Great work!
I installed via apt-get and got
sh: can't create /home/user/.config/QMLBrowser searchengines.conf: Permission denied
too, i created the file and after that reinstalling worked.

I tried to benchmark via sunspider 1.0.2 , but it fails at 4 or 3 with:
QNetworkReplyImpl::_q_startOperation was called more than once

anyone has some results or the same error?