I am able to reproduce this issue by opening
file://usr/share/doc/python/FAQ.html when running Firefox in Safe Mode.
However, I did not get the warning when opening about:blank.
$ dpkg-query --status firefox
Package: firefox
Status: install ok installed
Maintainer: Ubuntu Mozilla Team <ubuntu-mozillat...@lists.ubuntu.com>
Architecture: amd64
Version: 47.0+build3-0ubuntu0.16.04.1
Xul-Appid: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
$ lsb_release -a
Description: Ubuntu 16.04.1 LTS
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https://bugs.launchpad.net/bugs/1423441
Title:
getPreventDefault deprecation warning always logged to console
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