Building an Extension - MDC FireFox拡張機能のチュートリアルAdd-ons allow developers to extend and modify the functionality of Firefox. They are written using standard Web technologies - JavaScript, HTML, and CSS - plus some dedicated JavaScript APIs. Among other things, an add-on could: Change the appearance or content of particular websites Modify the Firefox user interface Add new features to Firefox There are several types of add-ons, but the most comm
