Changes

Add this to the end of all.js file (you will find this file in "%ProgramFiles%\Mozilla Firefox\greprefs\"):

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

'''NOTE: all.js file will be overwritten whenever you make Firefox update - don't forget to re-add the above line to all.js after you upgrade Firefox.'''

Then, create a file called mozilla.txt (yes, mozilla.txt, not

mozilla.cfg), and put your custom settings there (NOTE: this file has to begin with //, as the first line of this config file seem to be ignored):

//

lockPref("network.proxy.backup.ftp", "your.proxy");

If you don't care about encoding the mozilla.cfg file, append this config to all.js instead:

pref("general.config.obscure_value", 0);

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

http://developer.mozilla.org/en/docs/Automatic_Mozilla_Configurator:Locked_config_settings:

== Disabling auto update ==