till valid in Ubuntu 16.04.1 and Firefox 49.0+build4-0ubuntu0.16.04.1

How to reproduce (set some invalid host and port

gsettings set org.gnome.system.proxy mode 'manual'
gsettings set org.gnome.system.proxy.http host 'nonexistinghost'
gsettings set org.gnome.system.proxy.http port 9999
gsettings set org.gnome.system.proxy mode 'none'

Expected outcome: FF will not use any proxy and any website will be normally 
accessible.
Actual outcome: Visiting any page result in: The proxy server is refusing 
connections

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https://bugs.launchpad.net/bugs/1194841

Title:
  Firefox 22 uses stale manual proxy settings when configured to use
  system proxy settings, and system proxy settings are set to "None"

Status in Mozilla Firefox:
  Fix Released
Status in firefox package in Ubuntu:
  Fix Released
Status in firefox source package in Precise:
  Fix Released
Status in firefox source package in Quantal:
  Fix Released
Status in firefox source package in Raring:
  Fix Released

Bug description:
  *** WORKAROUND ***

  This only applies if you have Firefox configured to use the system
  proxy settings (which is the default) and have used the manual
  settings at some point in the past.

  1) Open the proxy configuration dialog
     - Edit -> Preferences from the menu, open the "Advanced" pane, select the 
"Network"
       tab and press the "Settings" button next to "Configure how Firefox 
connects to
       the Internet"
  2) Delete any residual manual proxy configuration settings. To do this, you 
will need
     to select "Manual", delete the settings, click OK and then re-open the 
dialog to
     set it back to "System" again

  Note, we're going to respin Firefox 22 with the patch from
  https://bugzilla.mozilla.org/show_bug.cgi?id=817533 , even if upstream
  aren't

  ****

  I just received the upgrade to FF22 through the update-center. After
  restarting firefox, I wasn't able to connect to any single web-page.

  Checking the 'about:config' network settings, I found out that
  something had changed the proxy-settings and everything was directed
  to '134.246...' (don't remember the whole number). After resetting all
  proxy values, firefox worked again as usual.

  Heiko

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: firefox 22.0+build2-0ubuntu0.12.04.1
  Uname: Linux 3.2.30-120928-vanilla x86_64
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.3
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  heikok     2861 F.... pulseaudio
  BuildID: 20130620135945
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xe2e60000 irq 47'
     Mixer name : 'Intel CougarPoint HDMI'
     Components : 'HDA:111d76e7,10280492,00100102 
HDA:80862805,80860101,00100000'
     Controls      : 30
     Simple ctrls  : 13
  Channel: Unavailable
  CurrentDmesg:
   Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg 
-'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
   dmesg: write failed: Broken pipe
  Date: Wed Jun 26 13:14:53 2013
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  IpRoute:
   default via 192.168.0.1 dev wlan0  proto static
   169.254.0.0/16 dev wlan0  scope link  metric 1000
   192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.13  metric 
2
  Locales: extensions.sqlite corrupt or missing
  MarkForUpload: True
  MostRecentCrashID: bp-13ea1db5-8ece-432e-b626-743e32110510
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=22.0/20130620135945 (In use)
  RelatedPackageVersions:
   icedtea-7-plugin  1.2.3-0ubuntu0.12.04.2
   rhythmbox-mozilla 2.96-0ubuntu4.2
   totem-mozilla     3.0.1-0ubuntu21.1
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  SubmittedCrashIDs:
   bp-13ea1db5-8ece-432e-b626-743e32110510
   bp-9044c4a6-4c68-4661-951e-83a8a2100308
   bp-44c7c8ad-3f92-41bc-8ce0-9ef032100127
   bp-6e7b33f2-08ce-41cc-ba5b-a83022100127
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:

  dmi.bios.date: 05/24/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 01MCMN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA05:bd05/24/2011:svnDellInc.:pnLatitudeE6320:pvr01:rvnDellInc.:rn01MCMN:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6320
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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