Hi!

Does this occur with other browsers?

Thanks!

503 Service Unavailable = Bing Search

No only on Firefox.

Are you able to give a couple of examples where this problem always occurs with Firefox but not with other browsers ?

Please provide the address (URL) of examples that are publicly accessible without needing to login.

It may be of interest if you try out one of the tools on one of our contributor's site

• https://jeffersonscher.com/res/jstest.php

and paste the info from the Full HTTP Request Headers: box in to your next reply.

Information About Your Browser

Your browser supplies the following information to sites about itself. This is not a comprehensive list of all information available to the page. Data from HTTP Headers

Your browser's request includes the following data:

Browser "User Agent" string: Mozilla/5.0 (Windows NT 5.1; rv:27.0) Gecko/20100101 Firefox/27.0 AlexaToolbar/alxf-2.19 Your public IP address: 108.209.182.166 (REMOTE_ADDR) Referring page (if any): https://support.mozilla.org/en-US/questions/983427?esab=a&as=aaq

Full HTTP Request Headers: Host: jeffersonscher.com User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:27.0) Gecko/20100101 Firefox/27.0 AlexaToolbar/alxf-2.19 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: https://support.mozilla.org/en-US/questions/983427?esab=a&as=aaq Connection: keep-alive JavaScript Browser Tests navigator object properties

Scripts in web pages can check various properties of the navigator object. This information can be blocked or overridden by the user.

navigator.userAgent = Mozilla/5.0 (Windows NT 5.1; rv:27.0) Gecko/20100101 Firefox/27.0 navigator.appName = Netscape navigator.appCodeName = Mozilla navigator.appVersion = 5.0 (Windows) navigator.platform = Win32

Active plugins (navigator.plugins collection, does not show "Never Activate" plugins):

   Name (Version): Adobe Acrobat (10.1.9.22)
   Description: Adobe PDF Plug-In For Firefox and Netscape 10.1.9
   File name: nppdf32.dll
   Name (Version): BrowserPlus (from Yahoo!) v2.9.8 (2.9.8.0)
   Description: BrowserPlus -- Improve your browser! -- http://browserplus.yahoo.com/
   File name: npybrowserplus_2.9.8.dll
   Name (Version): Citrix Online Web Deployment Plugin 1.0.0.104 (1.0.0.104)
   Description: Citrix Online App Detector Plugin
   File name: npappdetector.dll
   Name (Version): Google Talk Plugin (5.1.4.17398)
   Description: Version 5.1.4.17398
   File name: npgoogletalk.dll
   Name (Version): Google Talk Plugin Video Accelerator (0.1.44.29)
   Description: Google Talk Plugin Video Accelerator version:0.1.44.29
   File name: npgtpo3dautoplugin.dll
   Name (Version): Google Talk Plugin Video Renderer (5.1.4.17398)
   Description: Version 5.1.4.17398
   File name: npo1d.dll
   Name (Version): Google Update (1.3.22.5)
   Description: Google Update
   File name: npGoogleUpdate3.dll
   Name (Version): Java Deployment Toolkit 7.0.510.13 (10.51.2.13)
   Description: NPRuntime Script Plug-in Library for Java(TM) Deploy
   File name: npdeployJava1.dll
   Name (Version): Java(TM) Platform SE 7 U51 (10.51.2.13)
   Description: Next Generation Java Plug-in 10.51.2 for Mozilla browsers
   File name: npjp2.dll
   Name (Version): Microsoft® DRM (9.0.0.4503)
   Description: DRM Netscape Network Object
   File name: npdrmv2.dll
   Name (Version): Microsoft® DRM (9.0.0.4503)
   Description: DRM Store Netscape Plugin
   File name: npwmsdrm.dll
   Name (Version): QuickTime Plug-in 7.7.4 (7.7.4.0)
   Description: The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
   File name: npqtplugin.dll
   Name (Version): QuickTime Plug-in 7.7.4 (7.7.4.0)
   Description: The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
   File name: npqtplugin2.dll
   Name (Version): QuickTime Plug-in 7.7.4 (7.7.4.0)
   Description: The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
   File name: npqtplugin3.dll
   Name (Version): QuickTime Plug-in 7.7.4 (7.7.4.0)
   Description: The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
   File name: npqtplugin4.dll
   Name (Version): QuickTime Plug-in 7.7.4 (7.7.4.0)
   Description: The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
   File name: npqtplugin5.dll
   Name (Version): RealDownloader Plugin (1.3.3.66)
   Description: RealDownloader Plugin
   File name: npdlplugin.dll
   Name (Version): RealNetworks(tm) RealDownloader Chrome Background Extension Plug-In (32-bit) (1.3.3.66)
   Description: RealNetworks(tm) RealDownloader Chrome Background Extension Plug-In
   File name: nprndlchromebrowserrecordext.dll
   Name (Version): RealNetworks(tm) RealDownloader HTML5VideoShim Plug-In (32-bit) (1.3.3.66)
   Description: RealNetworks(tm) RealDownloader HTML5VideoShim Plug-In
   File name: nprndlhtml5videoshim.dll
   Name (Version): RealNetworks(tm) RealDownloader PepperFlashVideoShim Plug-In (32-bit) (1.3.3.66)
   Description: RealNetworks(tm) RealDownloader PepperFlashVideoShim Plug-In
   File name: nprndlpepperflashvideoshim.dll
   Name (Version): RealPlayer Download Plugin (16.0.3.51)
   Description: RealPlayer Download Plugin
   File name: nprpplugin.dll
   Name (Version): RealPlayer(tm) G2 LiveConnect-Enabled Plug-In (32-bit) (16.0.3.51)
   Description: RealPlayer(tm) LiveConnect-Enabled Plug-In
   File name: nppl3260.dll
   Name (Version): Shockwave Flash (12.0.0.70)
   Description: Shockwave Flash 12.0 r0
   File name: NPSWF32_12_0_0_70.dll
   Name (Version): Silverlight Plug-In (5.1.20913.0)
   Description: 5.1.20913.0
   File name: npctrl.dll
   Name (Version): Windows Media Player Plug-in Dynamic Link Library (3.0.2.629)
   Description: Npdsplay dll
   File name: npdsplay.dll
   Name (Version): Windows Presentation Foundation (3.5.30729.1)
   Description: Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
   File name: NPWPF.dll
   Name (Version): Yahoo Application State Plugin (1.0.0.7)
   Description: Yahoo Application State Plugin version 1.0.0.7
   File name: npYState.dll
   Name (Version): iTunes Application Detector (1.0.1.1)
   Description: iTunes Detector Plug-in
   File name: npitunes.dll

DOM object detection: objects/methods/collections

As a more reliable indication of a browser's capabilities, scripts can check for the existence of various objects and properties:

if(document.getElementById) = true; // all modern browsers support this method if(document.layers) = false; // this collection identifies Netscape version 4 only if(document.all) = false; // this object works in IE4-8 and emulations thereof

Copyright © 2013 Jefferson Scher. Updated 12/24/2013.

this is my problem too. This is what comes up in the address line eg. http://www.lumosity.com/login?utm_source=SilverpopMailing&utm_medium=email&utm_campaign=SUB_Newsletter_SciBehindLumosity_Train_2013.11.26&utm_content=&ll_src=SUB_Newsletter_SciBehindLumosity_Train_2013.11.26&ll_ch=EMAIL&ll_u=28907631&spMailingID=20496352&spUserID=NDEwNTk0NDg0NTUS1&spJobID=280391573&spReportId=MjgwMzkxNTczS0 or I also get this error message : "The proxy server is refusing connections" or i get" firefox not responding" and the whole thing freezes