Offline Website Data: If you've allowed it, a website can store files on your computer so that you can continue to use it when you are not connected to the Internet.

Clearing this logs you out of those sites.

Active Logins: If you have logged in to a website that uses HTTP authentication since you most recently opened Firefox, that site is considered 'active'.

Cache: The cache stores temporary files, such as web pages and other online media, that Firefox downloaded from the Internet to speed up loading of pages and sites you've already seen.

For more info about tracking, see How do I turn on the Do Not Track feature?. Cookies can also be used by third parties to track you across sites.

Cookies: Cookies store information about websites you visit, such as site preferences or login status.

Search history includes items you've entered into the search field on the New Tab page or into Firefox's Search bar.

Form & Search History: Form history includes the items you've entered into web page forms for Form autocomplete.

Download history is the list of files you've downloaded that are shown in the Downloads window.

Browsing & Download History: Browsing history is the list of sites you've visited that are shown in the History menu, the Library window's History list and the address bar autocomplete list.

5 Remove a single website from your history.

4 Clear cookies and data for a specific website.

3 How do I make Firefox clear my history automatically?.

1 What things are included in my history?.

Clear search history windows 10