firefox proxy settings via command line

Question

How do I change Firefox Proxy settings via command line on windows xp 2k   Thanks

User · Answer

The easiest way to do this is to configure your Firefox to use a PAC with a file URL, and then change the file URL from the line command before you start Firefox.

This is the easiest way. You don't have to write a script that remembers what path to prefs.js is (which might change over time).

You configure your profile once, and then you edit the external file whenever you want.

User · Answer

I found a better way to do this with powershell under windows  but really only because I was looking for a way to script changing the user agent string  not muck about with proxies    function set-uas       Param                    string  UAS    Default              FirefoxPrefs    C  Users Admin AppData Roaming Mozilla Firefox Profiles   default prefs js       if   UAS -eq  Default                  fileinfo   type  FirefoxPrefs          fileinfo    fileinfo   findstr  v  general appname override               fileinfo    fileinfo   findstr  v  general appversion override           fileinfo    fileinfo   findstr  v  general platform override             fileinfo    fileinfo   findstr  v  general useragent appName             fileinfo    fileinfo   findstr  v  general useragent override            fileinfo    fileinfo   findstr  v  general useragent vendor              fileinfo    fileinfo   findstr  v  general useragent vendorSub           fileinfo     user pref   useragentswitcher import overwrite    false   n           fileinfo     user pref   useragentswitcher menu hide    false   n           fileinfo     user pref   useragentswitcher reset onclose    false   n           fileinfo   Out-File -FilePath  FirefoxPrefs -Encoding ASCII           else               set-uas Default            if   UAS -eq  iphone                  fileinfo               fileinfo     user pref   general appname override      Netscape     n           fileinfo     user pref   general appversion override      5 0  iPhone  U  CPU iPhone OS 3 0 like Mac OS X  en-us  AppleWebKit 528 18  KHTML  like Gecko  Version 4 0 Mobile 7A341 Safari 528 16     n           fileinfo     user pref   general platform override      iPhone     n                                                                                                                                                 fileinfo     user pref   general useragent appName      Mozilla     n                                                                                                                                                fileinfo     user pref   general useragent override      Mozilla 5 0  iPhone  U  CPU iPhone OS 3 0 like Mac OS X  en-us  AppleWebKit 528 18  KHTML  like Gecko  Version 4 0 Mobile 7A341 Safari 528 16     n           fileinfo     user pref   general useragent vendor      Apple Computer  Inc      n                                                                                                                                    fileinfo     user pref   general useragent vendorSub           n                                                                                                                                                     fileinfo     user pref   useragentswitcher reset onclose    false   n           fileinfo   Out-File -FilePath  FirefoxPrefs -Encoding ASCII -Append           elseif   UAS -eq  lumia                  fileinfo               fileinfo     user pref   general appname override      Netscape     n           fileinfo     user pref   general appversion override      9 80  Windows Phone  Opera Mini 9 0 0 37 6652  U  en  Presto 2 12 423 Version 12 16     n           fileinfo     user pref   general platform override      Nokia     n                                                                                                                                                  fileinfo     user pref   general useragent appName      Mozilla     n                                                                                                                                                fileinfo     user pref   general useragent override      Opera 9 80  Windows Phone  Opera Mini 9 0 0 37 6652  U  en  Presto 2 12 423 Version 12 16     n           fileinfo     user pref   general useragent vendor      Microsoft     n                                                                                                                                       fileinfo     user pref   general useragent vendorSub           n                                                                                                                                                     fileinfo     user pref   useragentswitcher reset onclose    false   n           fileinfo   Out-File -FilePath  FirefoxPrefs -Encoding ASCII -Append           I have the firefox plugin  useragentswitcher  also installed  and have not tested this without it  I also have set  user pref  useragentswitcher reset onclose   false      EDIT  I ve revised my code  it was occasionally outputting some bad character or something   For some reason this is detected by firefox as a corrupt profile  and the entire profile was discarded  and refreshed with a default profile   Also  credit where credit is due  this code is loosely based off of what xBoarder posted in his response to sam3344920  https   stackoverflow com a 2509088 5403057    Also  I was able to fix the encoding bug with help from a post from Phoenix14830  https   stackoverflow com a 32080395 5403057    Edit2  Added support for setting the UAS to lumia   This is actually using an Opera mobile UAS  because I still wanted bing to work  and if you use the regular lumia UAS www bing com redirects to bing       amp   which firefox doesn t know how to process

User · Answer

Hello I got the Perfect cod use this code   cd  D   APPDATA  Mozilla Firefox Profiles   cd   default  set ffile  cd   echo user pref  network proxy http    127 0 0 1      prefs js  echo user pref  network proxy http port   8080     prefs js  set ffile   cd  windir

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cd  D     APPDATA  Mozilla Firefox Profiles    cd   default set ffile  cd  echo   user pref  network proxy http       1       ffile  prefs js  echo   user pref  network proxy http port     3128      ffile  prefs js  echo   user pref  network proxy type     1      ffile  prefs js  set ffile  cd    windir    This is nice   Thanks for writing this  I needed this exact piece of code for Windows  My goal was to do this by learning to do it with Linux first and then learn the Windows shell which I was not happy about having to do so you saved me some time   My Linux version is at the bottom of this post  I ve been experimenting with which file to insert the prefs into  It seems picky  First I tried in     mozilla firefox   default prefs js but it didn t load very well  The about config screen never showed my changes  Currently I ve been trying to edit the actual Firefox defaults file  If someone has the knowledge off the top of their head could they rewrite the Windows code to only add the lines if they re not already in there  I have no idead how to do sed awk stuff in Windows without installing Cygwin first    The only change I was able to make to the Windows scripts is above in the quoted part  I change the IP to  1 so when you call the script from the command line you can give it an option instead of having to change the file       bin bash version   firefox -v   awk   print substr  3 1 3      echo  version   is the version     Insert an ip into firefox for the proxy if there isn t one if   grep network proxy http  etc firefox- version pref firefox js    then echo  pref  network proxy http       1         gt  gt   etc firefox- version pref firefox js  fi    Even if there is change it to what we want sed -i s    network proxy http       pref  network proxy http       1          etc firefox- version pref firefox js     Set the port if   grep network proxy http port  etc firefox- version pref firefox js    then echo  pref  network proxy http port   9980     gt  gt   etc firefox- version pref firefox js    else sed -i s    network proxy http port     pref  network proxy http port   9980      etc firefox- version pref firefox js  fi    Turn on the proxy if   grep network proxy type   etc firefox- version pref firefox js    then echo  pref  network proxy type   1     gt  gt   etc firefox- version pref firefox js    else sed -i s    network proxy type     pref  network proxy type   1       etc firefox- version pref firefox js  fi

User · Answer

Just wanted to post the code in a cleaner format    originally posted by sam3344920 cd  D  quot  APPDATA  Mozilla Firefox Profiles quot  cd   default set ffile  cd  echo user pref  quot network proxy http quot    quot 148 233 229 235  quot    gt  gt  quot  ffile  prefs js quot  echo user pref  quot network proxy http port quot   3128   gt  gt  quot  ffile  prefs js quot  echo user pref  quot network proxy type quot   1   gt  gt  quot  ffile  prefs js quot  set ffile  cd  windir    If someone wants to remove the proxy settings  here is some code that will do that for you  cd  D  quot  APPDATA  Mozilla Firefox Profiles quot  cd   default set ffile  cd  type  quot  ffile  prefs js quot    findstr  v  quot user pref  quot network proxy type quot   1   quot   gt  quot  ffile  prefs  js quot  rename  quot  ffile  prefs js quot   quot prefs   js quot  rename  quot  ffile  prefs  js quot   quot prefs js quot  del  quot  ffile  prefs   js quot  set ffile  cd  windir   Explanation  The code goes and finds the perfs js file  Then looks within it to find the line  quot user pref  quot network proxy type quot   1   quot   If it finds it  it deletes the file with the  v parameter  The reason I added the rename and delete lines is because I couldn t find a way to overwrite the file once I had removed the proxy line  I m sure there is a more efficient safer way of doing this

User · Answer

for the latest firefox you must change   cd   default   to   cd   default

User · Answer

You can easily launch Firefox from the command line with a proxy server using the -proxy-server option   This works on Mac  Windows and Linux   path to firefox firefox exe -proxy-server  proxy URL   Mac Example    Applications Firefox app Contents MacOS firefox -proxy-server proxy example com

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Thank very much  I find the answers in this website    Here I refer to the production of a cmd file   by minimo   cd  D   APPDATA  Mozilla Firefox Profiles  cd   default set ffile  cd  echo user pref  network proxy http    192 168 1 235     gt  gt   ffile  prefs js  echo user pref  network proxy http port   80   gt  gt   ffile  prefs js  echo user pref  network proxy type   1   gt  gt   ffile  prefs js  set ffile  cd  windir

User · Answer

I don t think you can  What you can do  however  is create different profiles for each proxy setting  and use the following command to switch between profiles when running Firefox   firefox -no-remote -P  lt profilename gt

User · Answer

I don t think there is a direct way to set the proxy  on Windows     You could however install an add-on like FoxyProxy  create several configurations for different proxies and prior to starting FireFox move the appropriate configuration to the correct folder in your FireFox profile  using a batch file

User · Answer

You could also use this Powershell script I wrote to do just this  and all other Firefox settings as well   https   bitbucket org remyservices powershell-firefoxpref wiki Home  Using this you could easily manage Firefox using computer startup and user logon scripts  See the wiki page for directions on how to use it

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it working perfect   cd  D   APPDATA  Mozilla Firefox Profiles  cd   default set ffile  cd  echo user pref  network proxy ftp    YOUR PROXY SERVER     gt  gt prefs js echo user pref  network proxy ftp port   YOUR PROXY PORT    gt  gt prefs js echo user pref  network proxy http    YOUR PROXY SERVER     gt  gt prefs js echo user pref  network proxy http port   YOUR PROXY PORT    gt  gt prefs js echo user pref  network proxy share proxy settings   true    gt  gt prefs js echo user pref  network proxy socks    YOUR PROXY SERVER     gt  gt prefs js echo user pref  network proxy socks port   YOUR PROXY PORT    gt  gt prefs js echo user pref  network proxy ssl    YOUR PROXY SERVER     gt  gt prefs js echo user pref  network proxy ssl port   YOUR PROXY PORT    gt  gt prefs js echo user pref  network proxy type   1    gt  gt prefs js set ffile  cd  windir

User · Answer

user js is better for customizations as you can include only the lines you want to manipulate  i e  instead of find-replace you can just overwrite the entire file  Also  prefs js  at least on Firefox 65 0 1 for Mac  starts with a warning      DO NOT EDIT THIS FILE        If you make changes to this file while the application is running     the changes will be overwritten when the application exits        To change a preference value  you can either     - modify it via the UI  e g  via about config in the browser   or    - set it within a user js file in your profile    In my case  user js didn t exist  so I created it and included the line to switch between  No proxy  and  Manual proxy configuration   I m using only one SOCKS proxy all the time  so no need to change port number or any other details  just flip 0 to 1 in the following line    user pref  network proxy type   1    I ended up with a bash script that I placed at  usr local bin firefox      bin bash if      -eq 0    then   echo  user pref  network proxy type   0     gt    Library Application  Support Firefox Profiles t5rvw47o default user js   open -a Firefox else   case  1 in     vpn        echo  user pref  network proxy type   1     gt    Library Application  Support Firefox Profiles t5rvw47o default user js       open -a Firefox   esac  fi   To use it  I make sure no Firefox is running and then run firefox to have a straight connection and firefox vpn to use proxy

User · Answer

The proxy setting is stored in the user s prefs js file in their Firefox profile   The path to the Firefox profile directory and the file is    APPDATA  Mozilla Firefox Profiles 7b9ja6xv default prefs js  where  7b9ja6xv  is a random string  However  the directory of the default profile always ends in   default   Most of the time there will be only one profile anyway   Setting you are after are named  network proxy http  and  network proxy http port    Now it depends on what technology you are able prepared to use to change the file    P S   If this is about changing the proxy settings of a group of users via the logon script or similar  I recommend looking into the possibility of using the automatic proxy discovery  WPAD  mechanism  You would never have to change proxy configuration on a user machine again

User · Answer

All the other answers here explain how to program your proxy settings into Firefox which is what WPAD was invented to do  If you have WPAD configured then just tell Firefox to use it to auto-detect its settings  as you would in the GUI     To do this from a cmd file or command line   pushd   APPDATA  Mozilla Firefox Profiles   default  echo user pref  network proxy type   4   gt  gt prefs js popd   This of course requires you to have WPAD configured and working correctly  Also I believe prefs js won t exist until you ve run Firefox once

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I needed to set an additional option to allow SSO passthrough to our intranet site  I added some code to an example above   pushd   APPDATA  Mozilla Firefox Profiles   default  echo user pref  network proxy type   4   gt  gt prefs js echo user pref  network automatic-ntlm-auth trusted-uris   site domain com  sites domain com    gt  gt prefs js popd

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echo off color 1F   cd  D   APPDATA  Mozilla Firefox Profiles  cd   default  set ffile  cd  cd  ffile  echo user pref  network proxy http    192 168 1 235     gt  gt  prefs js   echo user pref  network proxy http port   80   gt  gt  prefs js   echo user pref  network proxy type   1   gt  gt  prefs js   set ffile  cd  windir

User · Answer

Firefox  I don t think you can  IE is another story though

User · Answer

This is the final compiled solution which worked for me    Tried and tested     Steps to Change Proxy settings in Mozilla Firefox via cmd in Windows   cd  D   APPDATA  Mozilla Firefox Profiles  cd   default   To Replace Already Present Proxy Settings with User-defined ones   powershell -Command   gc prefs js  -replace  user pref   network proxy http      already present IP         user pref   network proxy http      your http proxy ip        Set-Content prefs js  powershell -Command   gc prefs js  -replace  user pref   network proxy http port    already present port       user pref   network proxy http port    your http proxy port      Set-Content prefs js  powershell -Command   gc prefs js  -replace  user pref   network proxy share proxy settings    already present value       user pref   network proxy share proxy settings    true      Set-Content prefs js  powershell -Command   gc prefs js  -replace  user pref   network proxy type    already present value       user pref   network proxy type    1      Set-Content prefs js   0 - No Proxy  1 - Manual Proxy Configuration  4 - Auto detect Proxy Settings  5 - Use System Settings default  cd  windir    To Check Already Present Proxy Settings   cd C  Users  username  AppData Roaming Mozilla Firefox Profiles sat2m7dr default  find  i  network proxy  prefs js   To Start Firefox from CMD using your defined proxy settings   cd C  Program Files  cd  Mozilla Firefox  firefox exe -ProfileManager Select default from the list  default-release is selected by default  and click ok    NOTE  You may not have to run step 14 again  Instead you can directly run firefox exe

[firefox] firefox proxy settings via command line

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