Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

I can't get lockPref("plugin.state.java", 2); to work in ver 35.0.1. I'm trying to lock this for a school district to take the PARCC test

  • 3 replies
  • 2 have this problem
  • 22 views
  • Last reply by Dg58

more options

I can't get the mozilla.cfg file to work in Firefox 35.0.1. I'm getting this error "Failed to read the configuration file. Please contact your system administrator"

mozilla.cfg // lockPref("plugin.state.java", 2);

local-settings.js pref("general.config.filename", "mozilla.cfg"); pref("general.config.obscure_value", 0);

I can't get the mozilla.cfg file to work in Firefox 35.0.1. I'm getting this error "Failed to read the configuration file. Please contact your system administrator" mozilla.cfg // lockPref("plugin.state.java", 2); local-settings.js pref("general.config.filename", "mozilla.cfg"); pref("general.config.obscure_value", 0);

Chosen solution

Thank you for the responses.

I got it working by placing the files in these directories. I’m using Mac OS X 10.7.5 and above.

/Applications/Firefox.app/Contents/Resources/mozilla.cfg /Applications/Firefox.app/Contents/Resources/defaults/pref/local-settings.js

Read this answer in context 👍 0

All Replies (3)

more options

Hi Dg58,

if you have set the local-settings.js file with the order : pref("general.config.filename", "mozilla.cfg"); pref("general.config.obscure_value", 0);

then try with the opposite order :

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

http://kb.mozillazine.org/Locking_preferences

thank you

more options

If you get ""Failed to read the configuration file" then that means that Firefox finds the local-settings.js, but doesn't find the mozilla.cfg file or that there is a problem with that file. Make sure that you have saved the mozilla.cfg file as a text file and that the file is in the Firefox application folder.

more options

Chosen Solution

Thank you for the responses.

I got it working by placing the files in these directories. I’m using Mac OS X 10.7.5 and above.

/Applications/Firefox.app/Contents/Resources/mozilla.cfg /Applications/Firefox.app/Contents/Resources/defaults/pref/local-settings.js