I use the setting "keep cookies until I close firefox". This used to work fine before I started using tab groups. Now, it seems that since I have open tab groups that are saved between Firefox sessions, Firefox will no longer delete cookies when I close firefox. I think this is incorrect behavior, and I would like to see all my cookies deleted when I close the Firefox program, no matter how many tab groups (and tabs) are open. I looked for an addon to solve this issue, but found none. Note that in my troubleshooting information I have Cookies Manager+ installed. This is not the cause of the problem. I experience the problem both with and without that addon installed.