I am setting a cookie on my page with the following code:
document.cookie = "foo=bar";
This cookie is not visible in the cookies panel, but I can see it when I type
document.cookie in the console. I made sure the "Accept Cookies From Sites" option is enabled, as is "Default (Accept cookies)," and I'm not filtering the list at all.
I'm on Firefox 24.1.0 ESR and Firebug 1.12.6b1.