firefox proxy settings via command line

Question

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

Thanks

Answer 1

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

Answer 2

Firefox? I don't think you can. IE is another story though..

Answer 3

@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 ");>>"prefs.js" 
echo user_pref("network.proxy.http_port", 80);>>"prefs.js" 
echo user_pref("network.proxy.type", 1);>>"prefs.js" 
set ffile=
cd %windir%

Answer 4

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.

Answer 5

Just wanted to post the code in a cleaner format... originally posted by sam3344920

cd /D "%APPDATA%\Mozilla\Firefox\Profiles"
cd *.default
set ffile=%cd%
echo user_pref("network.proxy.http", "148.233.229.235 ");>>"%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%

---

If someone wants to remove the proxy settings, here is some code that will do that for you.

cd /D "%APPDATA%\Mozilla\Firefox\Profiles"
cd *.default
set ffile=%cd%
type "%ffile%\prefs.js" | findstr /v "user_pref("network.proxy.type", 1);" >"%ffile%\prefs_.js"
rename "%ffile%\prefs.js" "prefs__.js"
rename "%ffile%\prefs_.js" "prefs.js"
del "%ffile%\prefs__.js"
set ffile=
cd %windir%

Explaination: The code goes and finds the perfs.js file. Then looks within it to find the line "user_pref("network.proxy.type", 1);". 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...

Answer 6

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

1. cd /D "%APPDATA%\Mozilla\Firefox\Profiles"
2. cd *.default

To Replace Already Present Proxy Settings with User-defined ones

3. 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"
4. 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"
5. 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"

6. 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)

7. cd %windir%

To Check Already Present Proxy Settings

8. cd C:\Users\{username}\AppData\Roaming\Mozilla\Firefox\Profiles\sat2m7dr.default\
9. find /i "network.proxy" prefs.js

To Start Firefox from CMD using your defined proxy settings

12. cd C:\Program Files\
13. cd "Mozilla Firefox"
14. firefox.exe -ProfileManager
15. 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