Firefox : Managing Cookies

What is a Cookie?

A cookie is a file created by an Internet site to store information on your
computer, such as your preferences when visiting that site. When you visit a site
that uses cookies, the site might ask Firefox to place one or more cookies
on your hard disk.

Later, when you return to the site, Firefox sends back the cookies that
belong to the site. This allows the site to present you with information customized
to fit your needs.

Cookies can also store personally identifiable information. Personally identifiable
information is information that can be used to identify or contact you, such as
your name, e-mail address, home or work address, or telephone number. However, a
web site only has access to the personal information that you provide. For
example, a web site cannot determine your e-mail address unless you provide it. Also,
a web site cannot gain access to other information on your computer.

When you use the default cookie settings, this activity is invisible to you,
and you won’t know when a web site is setting a cookie or when Firefox
is sending a web site its cookie. However, you can set your cookies
optionspreferences so that you will be asked before a cookie is set. You can also
restrict the lifetime of cookies to your current Firefox session.

Setting Up Cookie Rules

By default Firefox accepts all cookies, including cookies which
would allow a site to recognize you effectively forever. If this doesn’t suit
you, you can tell Firefox to delete all cookies when you close

1.   Select  Edit  > Preferences and open the Privacy panel.

2.   Select the I close Firefox  preference from the
Keep until menu.

If you want to grant sites you trust the ability to store cookies permanently
(e.g., to allow you to log in automatically to a site), click Exceptions..., enter the site address,
and click Allow.

All the Settings

These are the  preferences that affect how cookies are managed by

Accept cookies from sites

If you don’t want any sites to store cookies on your computer, uncheck
this  preference. Note that some sites may not work properly when
cookies are disabled. If you want to grant certain sites the ability to
store cookies, open the Cookies Exceptions
window by clicking Exceptions…, enter the site address, and click
Allow or Allow for Session.

Keep until

*     they expire

If this  preference is selected, each cookie will be removed when the
site that set it has determined the cookie should expire.

*     I close Firefox

If this  preference is selected, cookies will be removed when you
restart Firefox.  Web sites requiring the use of cookies will
still work, but if you restart Firefox, the web site will think
that you logged into the site for the first time again.

*     ask me every time

Display an alert every time a web site tries to store a cookie asking you
if you want that cookie stored.

Accepting and Blocking Cookies

If you’ve chosen ask me every time from the Keep until
menu, you’ll see a dialog whenever a site tries to store a cookie on your
computer providing the following options:


To allow this particular cookie, just click Allow. Use this if
you trust the site.

Allow for Session

If you want to allow this cookie for now, but have it deleted when you
exit Firefox, click Allow for Session. Use this if the
site doesn’t work without cookies, but you don’t want to have a permanent   cookie stored for it.


If you don’t want this cookie to be stored, click Deny. Use this
if you don’t trust the site or suspect that it’s compromising your privacy.

Use my choice for all cookies from this site

Select this checkbox before clicking any of the buttons if you want
Firefox to remember your decision and not ask again. The site will
be added to the Cookie Exceptions window,
where you can revert your choice should you wish to do so later.

The Cookies Exceptions Window

Access this window by clicking the Exceptions… button in cookies
preferences. Here you can make exceptions from your general cookies
preferences for specific sites. Using exceptions, you can allow all cookies,
reject all cookies, or allow all cookies but have them deleted when you exit
Firefox, regardless of your other cookie settings.

To add a site to this list, simply type the site’s domain name in the field
labeled Address of web site. Then click Block to reject
cookies from the site, click Allow to allow cookies from the site,
or click Allow for Session to allow cookies from the site but have
them deleted when you exit Firefox.

To remove a site from this list, select it and click Remove Site. To
clear the list completely, click Remove All Sites. This will clear
the exceptions list so your general cookies optionspreferences apply.

The View Cookies Window

Use the View Cookies window to view and remove cookies. To access it,
click the View Cookies button in cookies  preferences.

This window lists all cookies currently stored on your
computer, grouped by site. You can expand the sites and select a cookie to
display more information about it. You can also search for a site or a cookie
name by typing in the search bar.

To remove a cookie from the list, select it and click Remove Cookie.
To remove a site’s cookies, select the site and click Remove
Cookie(s). To wipe all cookies, click Remove All Cookies.

Copyright © 2003-2007 Contributors to the Mozilla Help Viewer Project.

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