In the arena of developing the websites, applications and various other user interface programs or systems, programming languages play central role. Properties, features, productivity, flexibility of all end products (websites, web applications, desktop applications) depends on the quality & standard of these programming or developing languages. There are several programming languages and technologies used by the developers for the development of various user interface tools. Among all these languages some of them are paid for installation and some of them are freely available on the internet for the use of developers.

XUL is totally open source programming language for the development of certainly very useful technical tools which can be used for the productive results in various areas such as business and other computer related jobs. Going further with the vital uses of this technology, before knowing deeply about it, commonly this unique language is popular for the development of extensions/ Plugins of the world-known browser Mozilla Firefox; secondly its architectural design can help developers to design desktop applications which also can leverage developer’s web application skills. Actually XUL stands for XML or XUL which is based on XML programming language.

Actually XUL is a user interface language as well cross-platform language and has various sets of user interface widgets (an element of a graphical user interface such as a button or scroll bar; also, a module of software for a personalized Web page) which are helpful to speed up the development process. As this unique language is having the cross platform property so it can develop applications by using one operating system and that application can run by using another operating system. For instance by using XUL, developers can build applications on LINUX and can run the application on WINDOWS.

According to experienced & talented developers, before using XUL a developer must be having deep expertise in XML language for the development of applications efficiently. Specially developers must be aware about XML name spaces and also should be well versed with HTML, Java Script and CSS. Moreover, smart developers should have expertise in those technologies which are productive in XUL development. There are various other techniques which can be used by the smart and talented developers to improve the productivity of the XUL applications such as they can use XPCOM in the (XUL based) application development to make it more productive for the end users.

Hence, XUL is a flexible programming language, under expert jurisdiction it cannot only be used for the development of Mozilla Firefox extensions/Plugins but several of other uses are possible with smart developing skills.