Don’t toss your cookies – edit them!
This is a neat extension for Firefox. It allows you to edit your cookies that are stored in your Web browser to allow you to add or delete information from them. Cookie setting set in preferences/options take priority over the changes applied by this cookie editor.
For example, if you set an option to have your cookies to expire at the end of session, you won’t be able to change the expiration date on cookies using the editor. Feed your cookie editing needs!