CookieKiller for FireFox is Allows quick removal of cookies for selected sites/domains. This is a small Firefox Extension that adds a sub-menu to the context menu which allows the user to selectively kill (remove) cookies based on the domain that set them. The user may also remove all cookies for the current domain or all cookies that are present.
Note that this extension will not protect any cookies, therefore it may not be appropriate for the ones that have pet cookies.

The license of this software is Free, you can free download and free use this browser plug-ins software.