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Lock preferences in Firefox 3 on Ubuntu

If your running computer in a domain(server-client model) u'll surly hav a firewall for your clients, Normally we can break this fire wall from the client machine by disabling the firewall in the browser by the following steps
firefox--> Edit-->Preferences-->advanced-->network-->settings-->by clicking the auto detect
(( if the proxy is manual then it will respond the firewall setting so u cant browse blocked sites.
You have to disable the proxy switch option from manual to auto detect option bu locking the preferences buttoon by the following steps.

1.  Add the following to the end of  /etc/firefox-3.0/pref/firefox.js:
// tell firefox to load customized config file
pref("general.config.obscure_value", 0);
pref("general.config.filename", "firefox.cfg");

2.  Create a file called firefox.cfg in /etc/firefox-3.0/pref/ with the following content (the first line in both files must start with a comment):
// Lock specific preferences in Firefox so that users cannot edit them
lockPref("app.update.enabled", false);
lockPref("network.proxy.http", "");
lockPref("network.proxy.http_port", 8080);
lockPref("network.proxy.type", 1);
lockPref("network.proxy.no_proxies_on", "localhost,,");
lockPref("network.proxy.share_proxy_settings", true);
lockPref("browser.startup.homepage", "");

3. Create another file in /etc/firefox-3.0/pref/ called with the following contents (Thanks to Jeffrey LePage for this script):
# start of file
use strict;

# this gets the current firefox version
my $fire_ver = `/usr/bin/firefox -v`;

# this parses the version
$fire_ver =~ s/^\s*Mozilla\s+Firefox\s+([\d\.]+).*$/$1/;
#Mozilla Firefox 3.0.13, Copyright (c) 1998 - 2009

# this looks for firefox.cfg
if( -e "/usr/lib/firefox-$fire_ver/firefox.cfg" )
# firefox.cfg exists - this is good, no action is necessary
# make a symlink
symlink("/etc/firefox-3.0/pref/firefox.cfg", "/usr/lib/firefox-$fire_ver/firefox.cfg");
# end of  file

4. Open the root crontab editor by typing the following in a terminal window:
sudo crontab -e
Add the following to the end of the root crontab in the crontab editor:
# Copy firefox.cfg to the current Firefox binary directory
# to keep it working following an upgrade until this bug is fixed.
* * * * * /usr/bin/perl /etc/firefox-3.0/pref/ /dev/null 2>&1
This script will create a symlink to firefox.cfg every minute in the current Firefox binary directory (/usr/lib/firefox-3.0.x where x is the version number) to protect againt upgrades where the directory changes to x+1.  This is a very short script, so running it every minute will have almost no CPU overhead.  But if you want even less CPU overhead, you could change the first asterisk in the crontab entry to */5 to make it run every 5 minutes instead of every minute, or */10 for every 10 minutes, etc.

5. Wait a minute for the crontab to fire.  Then restart Firefox, and the preferences should be locked down.  You should be able to use this to lock down any setting in about:config.

After this the client user cant edit the preferences option any more.


Saravanan.E said...

Super.. But i hate this..

KLN said...

but ny way browser9 has done u a lot instead, right!?

jslim28 said...

That's easy. I have another friendly guide for you at

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