JavaScript is an object-based language based on prototypes, rather than being class-based. Because of this different basis, it can be less apparent how JavaScript allows you to create hierarchies of objects and to have inheritance of properties and their values. This chapter attempts to clarify the situation. This chapter assumes that you are already somewhat familiar with JavaScript and that you
This is an archived page. It's not actively maintained. Support for extensions using XUL/XPCOM or the Add-on SDK was removed in Firefox 57, released November 2017. As there is no supported version of Firefox enabling these technologies, this page will be removed by December 2020. Add-ons using the techniques described in this document are considered a legacy technology in Firefox. Don't use these
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
XUL Tutorial A guided tutorial that will help you get started with XUL, originally from XULPlanet. XUL (XML User Interface Language) is Mozilla's XML-based language for building user interfaces of applications like Firefox. The term XUL is sometimes used to refer to the whole Mozilla platform (e.g. XUL applications are applications using XUL and other components of the platform). XUL Controls list
This is an archived page. It's not actively maintained. This reference describes the interfaces and functions provided by the XPCOM library. In addition, it details the various helper classes and functions, as well as the components, provided by the XPCOM glue library. The contents herein are oriented primarily toward extension developers and people embedding XPCOM in other projects. WebExtensions
JavaScript Tutorials Complete beginners JavaScript basics JavaScript first steps JavaScript building blocks Introducing JavaScript objects JavaScript Guide Introduction Grammar and types Control flow and error handling Loops and iteration Functions Expressions and operators Numbers and dates Text formatting Regular expressions Indexed collections Keyed collections Working with objects Using classe
JavaScript Tutorials Complete beginners JavaScript basics JavaScript first steps JavaScript building blocks Introducing JavaScript objects JavaScript Guide Introduction Grammar and types Control flow and error handling Loops and iteration Functions Expressions and operators Numbers and dates Text formatting Regular expressions Indexed collections Keyed collections Working with objects Using classe
The Document Object Model (DOM) connects web pages to scripts or programming languages by representing the structure of a document—such as the HTML representing a web page—in memory. Usually it refers to JavaScript, even though modeling HTML, SVG, or XML documents as objects are not part of the core JavaScript language. The DOM represents a document with a logical tree. Each branch of the tree end
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