bsmedberg: Unfortunately as soon as you load the windows module it starts listening for some events which is what is causing the CPOW traffic. bug 1133834
https://bugzil.la/1133834 — NEW, dtownsend@mozilla.com — [e10s] windows/observer generates unnecessary CPOW usage
Seeing "Iconic Firefox Menu might be making Nightly run slow" upon https://bugzilla.mozilla.org/show_bug.cgi?id=1071880 landing.