Learn what "cookies" are, how websites use them, and how you can manage the cookies that Firefox stores.
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Cookies and site data are stored on your computer by websites you visit. Learn how to block websites from storing this data in Firefox.
More information about each permission request you may encounter when installing an extension into Firefox.
Learn what information is stored in your Firefox history and how to clear all or part of it if you are using a public or shared computer.
The Firefox "Page Info" window gives you details about the page you're on. You can also use it to change permissions for the website.
This article describes how to troubleshoot problems that involve websites reporting that cookies are blocked or disabled.
Learn about local storage, how to access storage settings, remove site data or set exceptions for websites to store data in Firefox.
Learn how to delete cookies that store website preferences and login status, remove site data and clear cached web content in Firefox.
Did Firefox save my login info? Did this website save it? How do I control what gets entered automatically? We'll explain how this works so can take control.
More information about each permission request you may encounter when installing an extension into Thunderbird.