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Firecookie

Firecookie is a an extension for Firebug that makes possible to view and manage cookies in your browser. Apart from all the other cookie managers and viewers available as Firefox extensions, this one is made as an extension for Firebug, so web developer has the functionality accessible within familiar Firebug's UI.

Firecookie has been integrated with Firebug 1.10a11 so, you don't need to install it for this version.

Download latest Firecookie v1.5b1 compatible with Firebug 1.10 and Firefox 14.0

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Once Firecookie is successfully installed you should see a new tab within Firebug's bar called simply Cookies. This tab displays a list of all cookies associated with domain of the currently displayed page. Each entry in the list displays basic information about a cookie (name, value, domain, path, expire date, etc.).

Inspect Cookies Every cookie in the list is expandable. This is useful especially when the cookie value is long and can't be fully displayed directly. If you are looking for a specific cookie by name, use Firebug's search box and write down it's name. The list is dynamically filtered as you type in the box.
Cookie Permissions You can also manage cookie permissions for the current site directly from the Firebug's toolbar. The permission button displays the current status as a label and it's automatically updated if the permission is changed (e.g. from the Firefox options dialog).
Cookie Events If you want to see when something happens to a cookie, use Firebug's Console tab. Firecookie creates a log entry every time when a cookie is created, changed, deleted or rejected. This can be switched off in Cookie tab->Options menu (click the black triangle next to the Cookies tab label to open this menu and uncheck Show logs in Console option).
Cookie Expire Time Cookie expire time is displayed using local timezone and current Firefox locale. It's easy to figure out the actual value. It's also possible to change the current value using a popup calendar and time picker.
Both calendar and time-picker has been introduced in Firefox 3.
Export Cookies Use Cookies menu to create new and remove an existing cookies. The same menu can be also used to export all cookies in the browser or only those that are associated with the current page into cookies.txt file in standard text format (every cookie + info takes one line).
Cookie Clipboard Standard clipboard actions Cut/Copy/Paste are also supported. If you need it, just right click on a cookie and use context menu. The same menu can be also used to edit properites of an exising cookie. Just pick Edit action and use the dialog that is displayed.
Sent & Received Cookies Firecookie is also integrated with existing Net panel. If you expand existing request in this panel, you'll see a new additional Cookies tab that displayes sent and received cookies with all informations just in place. This feature is available only with Firebug 1.4.
Sort Cookies You can sort cookies by clicking header in cookie list view. Just pick any column that should be used to sort cookies and click its label.
Denied Cookies All received but denied cookies are displayed in red.

Enhancements in Firecookie 0.9

JSON Inspector If a cookie value is formatted as JSON, there is a new JSON tab (selected by default) displaying the value using expandable tree. Similarly as for network responses in Firebug's Net panel.
XML Inspector If the value is valid XML document, there is a XML tab (also selected by default) displaying pretty printed & colorized XML.
document.cookie Better formatting is now implemented for document.cookie property when it's logged into the Console panel.
Column Visibility Manage visibility of columns using header context menu. Of course, the current settings is persistent across Firefox sessions.

Enhancements in Firecookie 1.0 (you need Firebug 1.5)

Cookie Breakpoint Create a cookie breakpoint to see when specific cookie is modified. Firebug debugger is integrated so, you can also see what line in the source code caused the modification.
Breakpoint Condition You can also create a breakpoint condition and the breakpoint will stop only if the condition is true. You can use cookie properties in the expression: value, path, host, expires [ms], isHttpOnly, isDomain).
Break On Next Cookie Change Firecookie also integrates with Firebug's Break On Feature. Just use the resume button to break on the next changed cookie.

Release Notes

Thanks to Sasa for designing the cookie icon.

Doc translation to Belorussian provided by Patricia.
Doc translation to German provided by Robert.
Doc translation to Hindi provided by Outshine Solutions.
Doc translation to Spanish provided by Maria Ramos.
Doc translation to Bulgarian provided by Ajoft Softwares.

Firecookie UI translations are managed on BabelZilla