Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Este fío arquivouse. Faga unha nova pregunta se precisa axuda.

Sccm install Firefox, now get error cant open program. Failed to read the configuration file. Please contact your system administrato

  • 1 resposta
  • 2 have this problem
  • 1 view
  • Last reply by cor-el

duskyhall
duskyhall
more options

I used a script to install it from this site. https://www.itsupportguides.com/configmgr-sccm/install-and-configure-firefox-silently/

I followed the instructions exactly as it on that site now none of my users can use firefox. they get the failed to read config file and program doenst launch.

I used a script to install it from this site. https://www.itsupportguides.com/configmgr-sccm/install-and-configure-firefox-silently/ I followed the instructions exactly as it on that site now none of my users can use firefox. they get the failed to read config file and program doenst launch.

Chosen solution

You get this error message when there is a .js (local-settings.js) file in the "defaults\pref" folder that specifies to process the mozilla.cfg file, but the mozilla.cfg isn't found.

Did you make sure that the mozilla.cfg doesn't have a hidden .txt file extension?

You can use the mozilla.cfg file in the Firefox program folder to set or lock preferences and run privileged JavaScript code.

A local-settings.js file needs to be placed in the "defaults/pref" folder where also the channel-prefs.js file is located to specify using mozilla.cfg. 

pref("general.config.filename", "mozilla.cfg");
pref("general.config.obscure_value", 0);

These functions can be used in the mozilla.cfg file: 

defaultPref();	// set new default value
pref();		// set pref, allow changes in current session
lockPref();	// lock pref, disallow changes

The mozilla.cfg file needs to start with a comment line (//).

See Configuration:

See also:

Ler a resposta no contexto 👍 1

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Chosen Solution

You get this error message when there is a .js (local-settings.js) file in the "defaults\pref" folder that specifies to process the mozilla.cfg file, but the mozilla.cfg isn't found.

Did you make sure that the mozilla.cfg doesn't have a hidden .txt file extension?

You can use the mozilla.cfg file in the Firefox program folder to set or lock preferences and run privileged JavaScript code.

A local-settings.js file needs to be placed in the "defaults/pref" folder where also the channel-prefs.js file is located to specify using mozilla.cfg. 

pref("general.config.filename", "mozilla.cfg");
pref("general.config.obscure_value", 0);

These functions can be used in the mozilla.cfg file: 

defaultPref();	// set new default value
pref();		// set pref, allow changes in current session
lockPref();	// lock pref, disallow changes

The mozilla.cfg file needs to start with a comment line (//).

See Configuration:

See also: