Cookies are stored on your computer by websites you visit and contain information such as site preferences or login status. This article describes how to block websites from storing cookies in Firefox.
To set Firefox to block cookies from one website:
To see a list of sites that you have blocked from setting cookies:
Select the Privacy panel.
To set Firefox to block cookies from all websites:
To remove cookies that were stored previously, see Delete cookies to remove the information websites have stored on your computer.
To set Firefox to accept cookies only from the website you're currently visiting, see Disable third-party cookies in Firefox to stop some types of tracking by advertisers.