A cookie is a piece of text that is stored on your computer by a web browser. Cookies can be used to store login info, preferences and shopping cart data. Many websites require cookies to be enabled before you can access them.
1) To see options to manage cookies, open the menu.
2) Go to Options.
3) And click Options.
4) Click the Privacy tab.
Uncheck this box to decline all cookies from all sites. This isn't advisable since doing so will make many websites unusable. Third-party cookies are set from a different domain than the one shown in the address bar. Usually it is safe to uncheck this box unless the site you are visiting requires it.
These options let you choose when to delete cookies: when they expire as per the expiration date set by the server, everytime Firefox closes, or ask each time.
5) Click Show Cookies to view the list of cookies that are currently stored.
You can search for cookies and manually delete ones from sites you don't recognize.
6) Click a cookie or site.
7) Then click Remove Cookie.
8) Click Close.
9) Click Exceptions.
This window lets you allow or block cookies from specific domains.
10) Type the address of a website.
11) Click Allow if you want to automatically accept all cookies from this domain.
Alternatively, you can choose Allow for Session which accepts all cookies from the specified domain until you close the browser.
12) Choose Block to decline all cookies from this site.
13) Click Close.
14) Click OK to close the options window.
That's it! Now you know how to manage cookies in Mozilla Firefox.
