The bug affect me, too (I noticed a serious slow-down of browsing, after
the upgrade). By going on " Firefox > Edit > Preferences > Advanced >
Settings > Configure Proxies", i noticed that when I set "auto-detect
proxy", everything works ok, while when I set "use system proxy
settings", the settings of the manual proxy configurations are used
(although I can't edit them, I have to choose manual configuration to be
able to do that).

A workaround is to choose auto-detection of proxy. Another workaround
(at least for me), is to choose manual proxy configuration, clean proxy
fields, and set back to "use system proxy settings".

So, user who never used proxy before should not be affected by this bug;
but user who used a proxy at least once, and then set back configuration
to "system proxy settings", after this upgrade will have the proxy
enabled again (if the proxy, meanwhile, has been shut down, browsing the
web will become impossible)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1194841

Title:
  Upgrade to ff22 enters proxy-settings

Status in “firefox” package in Ubuntu:
  Confirmed

Bug description:
  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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