The `app-strings` module gives you access to the host application's localized string bundles (`.properties` files). The module exports the `StringBundle` constructor function. To access a string bundle, construct an instance of `StringBundle`, passing it the bundle's URL: var StringBundle = require("app-strings").StringBundle; var bundle = StringBundle("chrome://browser/locale/browser.properties"); To get the value of a string, call the object's `get` method, passing it the name of the string: var accessKey = bundle.get("contextMenuSearchText.accesskey"); // "S" in the en-US locale To get the formatted value of a string that accepts arguments, call the object's `get` method, passing it the name of the string and an array of arguments with which to format the string: var searchText = bundle.get("contextMenuSearchText", ["universe", "signs of intelligent life"]); // 'Search universe for "signs of intelligent life"' in the en-US locale To get all strings in the bundle, iterate the object, which returns arrays of the form [name, value]: for (var [name, value] in Iterator(bundle)) console.log(name + " = " + value); Iteration --------- for (var name in bundle) { ... } Iterate the names of strings in the bundle. for each (var val in bundle) { ... } Iterate the values of strings in the bundle. for (var [name, value] in Iterator(bundle)) { ... } Iterate the names and values of strings in the bundle. @class The `StringBundle` object represents a string bundle. @constructor Creates a StringBundle object that gives you access to a string bundle. @param url {string} the URL of the string bundle @returns {StringBundle} the string bundle @method Get the value of the string with the given name. @param [name] {string} the name of the string to get @param [args] {array} (optional) strings that replace placeholders in the string @returns {string} the value of the string