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Ubuntu 14.04 - Firefox browser refuses to obey /etc/hosts

I have an entry in /etc/hosts pointing to a public internet IP which
doesn't already have a DNS hostname associated.

Following advice from this post: http://askubuntu.com/questions/117899
/configure-dnsmasq-to-use-etc-hosts-file

I added/edited this file on my system:
/etc/NetworkManager/dnsmasq.d/hosts.conf

Adding the following line:
addn-hosts=/etc/hosts

After restarting network-manager, nslookup and dig both respond with the
IP address configured in /etc/hosts as I would expect.

Firefox still refuses to obey the host entry. Even after a system
reboot. Even when dnsmasq is returning a result for command line DNS
lookup tools.

-- 
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https://bugs.launchpad.net/bugs/993298

Title:
  Please make NetworkManager-controlled dnsmasq respect /etc/hosts

Status in “network-manager” package in Ubuntu:
  Confirmed

Bug description:
  Since 12.04 NetworkManager uses the dnsmasq plugin by default to
  resolve DNS requests. Unfortunately the dnsmasq plug-in has --no-
  hosts, etc. hard coded [1] which means (among other things) that after
  the upgrade to 12.04 /etc/hosts will no longer be used to resolve DNS
  requests. This changes the prior behavior of NetworkManager without
  any visible warning to the end user. AFAICS there's no other way to
  work around this problem as to manually revert the change and disable
  the dnsmasq plug-in in the NetworkManager config, see [2,3]:

  "To turn off dnsmasq in Network Manager, you need to edit
  /etc/NetworkManager/NetworkManager.conf and comment the 'dns=dnsmasq'
  line then do a 'sudo restart network-manager'."

  This is of course not a bug in the NetworkManager which just behaves
  as intended. The problem is in the change of the configuration of the
  Ubuntu packaging which will probably leave many wondering why their
  /etc/hosts suddenly no longer works. This cost me considerable time to
  debug and probably is a usability problem for others, too.

  Maybe you could provide a more visible documentation than that in [3]?
  E.g., *including a comment in /etc/hosts that explains the change* and
  how to work around it would have saved me a lot of time. It would have
  automatically alerted me on upgrade as manual changes to /etc/hosts
  would then have triggered a prompt while leaving those users with
  standard /etc/hosts in peace.

  Probably similar problems arise with other disabled config files and
  could be alerted to the users? Thinking of resolv.conf, etc.

  [1] http://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/src/dnsmasq-manager/nm-dnsmasq-manager.c, line 285
  [2] i.e. http://ubuntuforums.org/showthread.php?t=1968061
  [3] http://www.stgraber.org/2012/02/24/dns-in-ubuntu-12-04/

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