User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36 Steps to reproduce: 1. Open a tab, go to about:preferences#privacy 2. Click on "Clear Data..." under Cookies and Site Data 3. Confirm with both options checked 3. Open another tab, do something that sets only session cookies. 4. Go back to the first tab, click on "Manage Data..." Actual results: Nothing is listed. If I close the Manager interface, then click on "Clear Data..." it tells me there are 0 bytes of cookies and site data. If I then confirm clearing and go back to the second tab and reload, the cookies were obviously cleared. If I open the dev tools in the second tab *instead of clearing them as described in the above paragraph*, then go to the storage tab, it correctly lists all the session cookies in use. Expected results: Session cookies are listed. Basically, I expect that if you're going to replace the absolutely wonderful UI that previously existed behind the "remove individual cookies" link in the privacy settings, the replacement would cover the same use case of providing a UI to see what cookies are present on my system. This is *incredibly* valuable when developing multi-domain products. The developer tools that show only a single site at a time aren't adequate for use cases involving many domains that each maintain important state.

Duplicate of bug 1460768?

Yeah, I think this is covered by bug 1460768 as written.

I just wanted to add that if you're looking for the specific use case of inspecting cookie contents across domains (something you may admit is not really a feature non-developer users are likely to need) there are several extensions that basically replicate the functionality of the old cookie manager (and more): https://addons.mozilla.org/de/firefox/addon/a-cookie-manager/ https://addons.mozilla.org/de/firefox/addon/cookiebro/ https://addons.mozilla.org/de/firefox/addon/cookie-quick-manager/