sajirdalas

//main.js

var cm = require("sdk/context-menu");

var item = cm.Item({
	label: "Search on google",
	data: "MyId",
	//context: cm.PageContext()
	//context: cm.URLContext(["*.mozilla.org","*.reddit.com"])
	//context: cm.SelectionContext()

sajirdalas

//silly.js

function sumNumbers(a, b){
	return a+b;
}

function sumNumbersAsync(a, b, callback){
	var result = a + b;
	callback(result);
}