Firefox is an example of application software.
Application software is a type of software that is designed to perform specific tasks for the user, such as creating documents, browsing the web, sending emails, etc. In other words, it is a program that is used to accomplish specific tasks and is meant to be used by the end-user, as opposed to system software, which is designed to run the computer itself and support the application software.
Firefox is a web browser, which is a type of application software that allows users to access, browse and interact with websites on the Internet.