What is xpcom?

You can immediately note that this component is found in a popular browser, namely in Mozilla Firefox browser. This component is also found in some other software. It can be immediately noted that XPCOM is not just a component, but a cross-platform component-oriented software development model. In our case, this model is intended for developing software for the Mozilla browser. Let's try to understand this component in more detail. We can immediately draw an analogy between this model and the Microsoft COM model. The Microsoft COM technology standard is also intended for software development. By the way, XPCOM can be called a framework, that is, the structure of a software system. A framework is software whose main purpose is to facilitate the development and integration of components of a large software object. In simpler terms, a framework is the framework of a software system.

It was written above that XPCOM is in many ways similar to Microsoft COM. But, probably, one of the main differences between these standards is that XPCOM is free software.

If we summarize everything written above, then it is not difficult to understand that XPCOM is needed for component programming. And as you know, in order to program something you need a compiler. What is the XPCOM component used for? Already from the name you can understand that using XPCOM you can write components in various programming languages. And these components can then be used in a single program. So, the Mozilla browser is proof of this.