You can use the `cookie` tool in what's called the "command line". It's been there for quite a while now: https://hacks.mozilla.org/2012/08/new-firefox-command-

You can use the `cookie` tool in what's called the "command line". It's been there for quite a while now: https://hacks.mozilla.org/2012/08/new-firefox-command-line-helps-you-develop-faster/ https://hacks.mozilla.org/2012/08/new-firefox-command-line-h... Granted, it's not an actual panel in the toolbox, but it gets the job done.