As you browse the web, Firefox helpfully remembers lots of information for you – sites you've visited, files you've downloaded and more. All of this information is called your history. However, if you are using a public computer or share a computer with someone, you may not want others to see these kinds of things.
This article explains what information is stored in your Firefox history and gives you step-by-step ways to clear all or part of it.
If you need to clear your history every time you use Firefox, you can set it to happen automatically on exit so you don’t forget.
Select the Privacy panel.