browser crashes saving image

testing on unity8 desktop on xenial + overlay + silo 2010

Right click on image and press "Save Image"
will sometimes work, but crashes quite frequently 1/4 times roughly

Here is thread trace, full core attached

sing host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `webbrowser-app --desktop_file_hint=/usr/share/applications/webbrowser-app.deskt'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f35552730a1 in QDBusAbstractInterface::asyncCallWithArgumentList(QString const&, QList<QVariant> const&)
    () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
[Current thread is 1 (Thread 0x7f356042e780 (LWP 10477))]
(gdb) bt
#0 0x00007f35552730a1 in QDBusAbstractInterface::asyncCallWithArgumentList(QString const&, QList<QVariant> const&)
    () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#1 0x00007f3553cc0858 in ?? () from /usr/lib/x86_64-linux-gnu/libubuntu-download-manager-client.so.1
#2 0x00007f34bdfdf997 in Ubuntu::DownloadManager::SingleDownload::setAllowMobileDownload(bool) ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/DownloadManager/libUbuntuDownloadManager.so
#3 0x00007f34bdfe18fc in Ubuntu::DownloadManager::SingleDownload::bindDownload(Ubuntu::DownloadManager::Download*)
    () from /usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/DownloadManager/libUbuntuDownloadManager.so
#4 0x00007f355e955c24 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5 0x00007f3553ceacaf in Ubuntu::DownloadManager::Manager::downloadCreated(Ubuntu::DownloadManager::Download*) ()
   from /usr/lib/x86_64-linux-gnu/libubuntu-download-manager-client.so.1
#6 0x00007f3553ce6770 in ?? () from /usr/lib/x86_64-linux-gnu/libubuntu-download-manager-client.so.1
#7 0x00007f355e955c24 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8 0x00007f35552adb9f in QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9 0x00007f35552adc98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#10 0x00007f355e956719 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f355feb1b1c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007f355feb7056 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007f355e9292a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f355e92b16a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f355e97df53 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f355d60f1a7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f355d60f400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007f355d60f4ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f355e97e35f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f355e926ffa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f355e92f6bc in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x000000000042bf55 in main ()
(gdb)