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    Cookies Preferences in Mozilla

    These preferences apply to most Mozilla products (including Firefox and Seamonkey), however they are application-specific, so not all of them may apply to you. The default values given are for Firefox 3.


    Default Value: 0

    0 = accept all cookies by default
    1 = only accept from the originating site (block third party cookies)
    2 = block all cookies by default
    3 = use p3p settings (note: this is only applicable to older Mozilla Suite and Seamonkey versions.)


    Default Value: 0

    0 = Accept cookies normally
    1 = Prompt for each cookie
    2 = Accept for current session only
    3 = Accept for N days


    Default Value: 90

    Only used if network.cookie.lifetimePolicy is set to 3

    Sets the number of days that the lifetime of cookies should be limited to.


    Default Value: false

    Only used if network.cookie.lifetimePolicy is set to 1

    true = accepts session cookies without prompting
    false = prompts for session cookies


    Default Value: false

    true = restrict third party cookies to the session only
    false = no restrictions on third party cookies


    Default Value: 1000

    Configures the maximum amount of cookies to be stored

    Valid range is from 0-65535, RFC 2109 and 2965 require this to be at least 300


    Default Value: 50

    Configures the maximum amount of cookies to be stored per host

    Valid range is from 0-65535, RFC 2109 and 2965 require this to be at least 20


    Default Value: true

    true = do not accept any cookies from within mailnews or from mail-style URIs
    false = allow cookies in these situations

    This preference is applicable to all versions of Seamonkey.

    New in Thunderbird 3 This preference is applicable to Thunderbird 3 and later. Earlier versions of Thunderbird only allowed cookies on RSS feeds.


    Default Value: false

    Migration pref for users with older profiles (before Mozilla 1.7). If you have the old-style prefs, they will be migrated when starting the application. (The old prefs are network.cookie.lifetime.enabled, network.cookie.lifetime.behavior, and network.cookie.warnAboutCookies.)

    true = prefs have been migrated
    false = migrate prefs on next startup

    Original Document Information

    • Author(s): Mike Connor
    • Last Updated Date: May 22, 2004
    • Copyright Information: Portions of this content are © 1998–2007 by individual contributors; content available under a Creative Commons license | Details.


    Document Tags and Contributors

    Contributors to this page: Sheppy, Huan, Kohei, kohei.yoshino, Beltzner, Dwitte, Standard8
    Last updated by: Huan,