Motivation for this new requirement is:

## Why

 Each particular network your computer and browser run in has its own set of
 network conditions, routers, proxies and MITM situations.

 Changing between networks also changes proxies. Intercepting or explicit,
 willing or unwilling, HTTP or even HTTPS with custom installed trust-roots.
 This makes the web content cache, the cookie store and others to save
 contents from one network that is potentially different than what is received
 over other networks. It can lead to content pollution and information leaks,
 on purpose by malicious actors or just by mistake.

see the details here

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apparmor in Ubuntu.

  From v49.0, Firefox needs read access to @{PROC}/net/arp

Status in apparmor package in Ubuntu:

Bug description:
  Since the latest upgrade of Firefox to 49.0, it will need read access
  to @{PROC}/net/arp

  I don't know what the security implications are, so I don't know if we
  want to give read access to explicitely deny it. Both seem to work.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: apparmor-profiles 2.10.95-0ubuntu2.2
  ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
  Uname: Linux 4.4.0-38-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Sep 29 16:55:21 2016
  InstallationDate: Installed on 2015-10-04 (361 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151002)
  PackageArchitecture: all
  ProcKernelCmdline: BOOT_IMAGE=/vmlinuz-4.4.0-38-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro noprompt persistent kaslr threadirqs quiet 
splash vt.handoff=7
  SourcePackage: apparmor
   Sep 29 10:37:52 franck-ThinkPad-T430s dbus[2546]: [system] AppArmor D-Bus 
mediation is enabled
   Sep 29 16:50:57 franck-ThinkPad-T430s dbus[2410]: [system] AppArmor D-Bus 
mediation is enabled
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.apparmor.d.sbin.klogd: [modified]
  modified.conffile..etc.apparmor.d.sbin.syslogd: [modified]
  modified.conffile..etc.apparmor.d.usr.bin.chromium-browser: [modified]
  modified.conffile..etc.apparmor.d.usr.sbin.avahi-daemon: [modified]
  modified.conffile..etc.apparmor.d.usr.sbin.dnsmasq: [modified]
  modified.conffile..etc.apparmor.d.usr.sbin.dovecot: [modified]
  modified.conffile..etc.apparmor.d.usr.sbin.identd: [modified]
  modified.conffile..etc.apparmor.d.usr.sbin.mdnsd: [modified]
  modified.conffile..etc.apparmor.d.usr.sbin.nmbd: [modified]
  modified.conffile..etc.apparmor.d.usr.sbin.nscd: [modified]
  modified.conffile..etc.apparmor.d.usr.sbin.smbd: [modified]
  mtime.conffile..etc.apparmor.d.sbin.klogd: 2015-10-05T12:04:03.854535
  mtime.conffile..etc.apparmor.d.sbin.syslogd: 2015-10-05T12:03:15.705968
  mtime.conffile..etc.apparmor.d.usr.sbin.dnsmasq: 2016-04-13T19:13:05.941424
  mtime.conffile..etc.apparmor.d.usr.sbin.dovecot: 2015-10-05T12:00:55.356323
  mtime.conffile..etc.apparmor.d.usr.sbin.identd: 2015-10-05T12:01:02.204403
  mtime.conffile..etc.apparmor.d.usr.sbin.mdnsd: 2015-10-05T12:02:37.861523
  mtime.conffile..etc.apparmor.d.usr.sbin.nmbd: 2015-10-05T12:00:10.119794
  mtime.conffile..etc.apparmor.d.usr.sbin.nscd: 2016-04-13T19:14:17.520643
  mtime.conffile..etc.apparmor.d.usr.sbin.smbd: 2015-10-05T12:00:26.103981

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