The EAsyncClosure pushes its own thread default main context, which
the EClient took as the one to use for any notifications, like about
property changes of the related D-Bus object, but this main context
doesn't live for long, it's effectively dead shortly after
the EClient open, thus the property changes are not received anymore,
which may eventually mean a stuck property value, like for
the 'read-only' state.

Michał Grzybowski authored Jan 14, 2015 and Piotr Drąg committed Jan 14, 2015

http://bugs.aviary.pl/show_bug.cgi?id=4982

Disable the DNS prefetching to avoid the unintended possible leakage of
date and IP address of whoever reads the message.

Reported downstream at https://bugzilla.redhat.com/show_bug.cgi?id=1175430

This turns out to be relatively simple to fix. Based on the patch in
http://bugzilla.mozilla.org/show_bug.cgi?id=229023

(cherry picked from commit 080e9fa3)