Hi, I understand your frustration in private tabs deleting on Firefox for iOS. There is a GitHub issue (different from the other question you linked) that I believe is related to this issue: https://github.com/mozilla-mobile/firefox-ios/issues/20073. Given that multiple posts have been made regarding this, I'll escalate this to the developers. If you have any more questions or information, feel free to reply. Thanks and have a great day!