Let's say you're using a shared computer and want to do something like shop or access your bank. This is the perfect time to use private browsing. Just click the menu and choose New Private Window. Notice that private browsing windows have a purple mask at the top. Firefox won't save any information about where you go in a private browsing window. Things like the pages you visit, what you search for, or enter into forms. It's important to know that private browsing doesn't make you invisible on the web. Your internet service provider or employer can still track the sites you go to. When you're finished with private browsing, you can just close the window and continue using Firefox like you normally do.