rem: delete this.prefManager.onPrefChanged; 
add: this.prefManager.onPrefChanged = function(){}; 
context: function PrefChannel(parent, name, force, show){    if (name in parent.channels)        return parent.channels[name];        this.parent = parent;    this.unicodeName = name;    this.viewName = name;    this.canonicalName = name;    this.encodedName = name;    this.prettyName = getMsg(MSG_PREFS_FMT_DISPLAY_CHANNEL,                              [this.parent.parent.unicodeName, this.unicodeName]);    this.prefManager = getChannelPrefManager(this);    this.prefs = this.prefManager.prefs;    delete this.prefManager.onPrefChanged;        if (force)        this.prefs["hasPrefs"] = true;        if (this.prefs["hasPrefs"] || show)        this.parent.channels[this.canonicalName] = this;        return this;};
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/63ec32fef05a123532f1d656a344187e02fe3759/config.js/clean/extensions/irc/xul/content/config.js