Extended Cookie Manager does this. https://addons.mozilla.org/en-US/firefox/addon/1243 https://addons.mozilla.org/en-US/firefox/addon/1243 Beware, it apparent

Extended Cookie Manager does this. https://addons.mozilla.org/en-US/firefox/addon/1243 https://addons.mozilla.org/en-US/firefox/addon/1243 Beware, it apparently doesn't work well (or at all) on windows.