Mozilla Firefox offers no way to manipulate cookies directly in the web browser unlike the Opera web browser. While cookie editing is probably not something that the majority of users would ever want to dive in there might be some users who would want to do just that. This can be web developers who want to test their websites with various settings or for security experts who test the security of a website. Being able to edit cookies in the browser makes it much easier to manipulate them. The second method would be to edit the cookies manually on the system’s hard drive or with an external software capable of doing that.
Add N Edit Cookies is a Firefox extension that integrates cookie manipulation in the web browser. A link to the cookie editor is added at the end of the tools menu. It will load in a separate window that acts independently meaning that it is possible to use Firefox with the Cookie Editor window being open.
The main window provides access to a filter that can be used to locate specific cookies. By default all cookies are shown in the list sorted by their site and cookie name. A click on a cookie will display extensive information including the cookie’s content, the path, host and expiration date.
A double-click on a cookie will load the editor with possibilities to edit the parameters of that cookie. It is possible to change the name, content, domain, path, connection and expiration date.
Another option would be to use the Cookie Editor to delete cookies. That’s simply a matter of selecting the cookies that should be deleted and pressing the Delete button.
The last option is the Add button which makes it possible to add a new cookie to the browser.
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Cookie Monster is another choice.
And there is another one called Extended Cookie Manager which is easier and better for general user.
https://addons.mozilla.org/en-US/firefox/addon/4703
https://addons.mozilla.org/en-US/firefox/addon/1243