Dear Maintainer,

There's a Nifty New Feature enabled by default.  I was trying to figure out why I
get spammed query[A] on my lan for push.services.mozilla.com

found this:
https://support.mozilla.org/en-US/kb/push-notifications-firefox?as=u&utm_source=inproduct

Might be a good addition to the README.

Thanks for the hard work keeping an up-to-date browser in debian!!