Clearing Cache and Cookies is an important first step for almost any troubleshooting for internet browsing. The 'cache' is a tool used by your. In most computer-based web browsers, to open menus used to clear your cache, cookies, and history, press Ctrl-Shift- Delete (Windows) or. The Firefox cache temporarily stores parts of websites you visit. Learn how to clear To clear your history (i.e. cookies, browsing history, cache, etc.) all at once.