Select the Firefox
button in the upper-left corner of the browser window (Firefox 4 and later). If you are using a version of Firefox older than version 4, select Tools
from the main toolbar.
Select the Privacy
From the Firefox will drop-down, select Remember history
. With this setting selected, Firefox will remember your browsing, download, form and search history, and keep cookies from websites you visit.
If you would like to specify the sites you would like to accept cookies from, select Use custom settings for history
from the Firefox will drop-down.
If the Accept cookies from sites
checkbox is checked, click on it to uncheck it.
in the Address of website field.