It's one thing to change the setup process and quite another to completely disable a feature... Perhaps the links on this page will help at least with the first part: [https://wiki.mozilla.org/Deployment:Deploying_Firefox Deployment:Deploying Firefox - MozillaWiki].

pref("general.config.filename", "mozilla.cfg");
pref("general.config.obscure_value", 0); // use this to disable the byte-shift

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

lockPref("xpinstall.enabled", false);

Use a mozilla.cfg file in the Firefox program folder to lock prefs or specify default values. Place a file local-settings.js in the defaults\pref folder where you also find the file channel-prefs.js to specify using mozilla.cfg. pref("general.config.filename", "mozilla.cfg"); pref("general.config.obscure_value", 0); // use this to disable the byte-shift See: * http://kb.mozillazine.org/Locking_preferences You can use these functions in mozilla.cfg: defaultPref(); // set new default value pref(); // set pref, but allow changes in current session lockPref(); // lock pref, disallow changes ----- To prevent users from installing software (extensions) use: lockPref("xpinstall.enabled", false); Note that this may not work if files are dropped in a location where Firefox scans for new extensions. *https://developer.mozilla.org/en/Addons/Add-on_Manager/AddonManager#Installation_scopes *https://developer.mozilla.org/en/Installing_extensions#Preventing_automatic_install_from_specific_locations