Allow Flickr Uploadr Extensions to store extra information for a user

gistfile1.js

var data = {

	_xpcom: Cc['@mozilla.org/preferences-service;1']
		.getService(Ci.nsIPrefService)
		.getBranch('opendns.'),

	get: function(k) {
		var t = this._xpcom.getPrefType(k);
		var fn;
		if (Ci.nsIPrefBranch.PREF_BOOL == t) { fn = 'getBoolPref'; }
		else if (Ci.nsIPrefBranch.PREF_INT == t) { fn = 'getIntPref'; }
		else { fn = 'getCharPref'; }
		try { return this._xpcom[fn](k); }
		catch (err) { return null; }
	},

	set: function(k, v) {
		var t = typeof v;
		if ('undefined' == t) { return false; }
		var fn;
		if ('boolean' == t) { fn = 'setBoolPref'; }
		else if ('number' == t) { fn = 'setIntPref'; }
		else { fn = 'setCharPref'; }
		try {
			this._xpcom[fn](k, v);
			return true;
		}
		catch (err) { return false; }
	},

	unset: function(k) {
		try { return this._xpcom.clearUserPref(k); }
		catch (err) { return null; }		
	}

};