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Disabling third party cookies

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Third-party cookies are cookies that are set by one site, but can be read by another site. For example, when you visit site1.com, it might set a cookie that can be read by site2.com.

Some advertisers use these types of cookies to track your visits to the various websites on which they advertise. If you are concerned about this, you can disable third-party cookies in Firefox.

NOTE:

Disabling third-party cookies in Firefox can stop some types of tracking by advertisers, but not all.
Some websites (e.g. Microsoft's Hotmail, MSN, and Windows Live Mail webmail) use third-party cookies for purposes that are not necessarily privacy concerns, and disabling third-party cookies may cause problems with those sites.

Third-party cookie settings are available in the OptionsPreferences window's Privacy panel:

3.0:

At the top of the Firefox windowOn the menu bar, click on the ToolsFirefoxEdit menu, and select Options...Preferences....
Select the Privacy panel.
Uncheck Accept third-party cookies.
Click OK to close the Options windowClick Close to close the Preferences windowClose the Preferences window

3.5/3.6:

At the top of the Firefox windowOn the menu bar, click on the ToolsFirefoxEdit menu, and select Options...Preferences....
Select the Privacy panel.
Set Firefox will: to Use custom settings for history.
Uncheck Accept third-party cookies.
Click OK to close the Options windowClick Close to close the Preferences windowClose the Preferences window.