This is probably related to https://bugzilla.mozilla.org/show_bug.cgi?id=1726736 (I couldn't find a bug describing exactly this regression).
** Bug watch added: Mozilla Bugzilla #1726736 https://bugzilla.mozilla.org/show_bug.cgi?id=1726736 ** Also affects: firefox via https://bugzilla.mozilla.org/show_bug.cgi?id=1726736 Importance: Unknown Status: Unknown ** Changed in: firefox (Ubuntu) Status: Confirmed => Fix Committed ** Summary changed: - Firefox do not save tabs + [upstream,regression] Firefox does not save tabs when quitting with Ctrl+Q -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1948652 Title: [upstream,regression] Firefox does not save tabs when quitting with Ctrl+Q Status in Mozilla Firefox: Unknown Status in firefox package in Ubuntu: Fix Committed Bug description: 1) % lsb_release -rd Description: Ubuntu 20.04.3 LTS Release: 20.04 2) % apt-cache policy firefox firefox: Установлен: 93.0+build1-0ubuntu0.20.04.1 Кандидат: 93.0+build1-0ubuntu0.20.04.1 Таблица версий: *** 93.0+build1-0ubuntu0.20.04.1 500 500 http://ua.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages 100 /var/lib/dpkg/status 75.0+build3-0ubuntu1 500 500 http://ua.archive.ubuntu.com/ubuntu focal/main amd64 Packages 3) After start Firefox expected to restore previous session 4) Firefox start with new tab If I close Firefox by Ctrl-Q with opened tabs and start it again Firefox opens with one new tab. When profile was recreated issue was gone but appeared again after Firefox was closed by Ctrl-W. The option "Restore previous session" is on. Without extension behavior the same. I'm not sure but this begins after last update of Firefox To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1948652/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
