Hi Jean-Paul, It looks like this issue is similar to bug 1932328. May you check this please? If yes, please mark it as duplicated.
Cheers, Matt -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1936393 Title: thunderbird window hided and abnormal context menu Status in thunderbird package in Ubuntu: New Bug description: Many times, when I minimize the main Thunderbird window to the dock, later, it's impossible to maximise it again (impossible to see it) and the contextual menu of the Thunderbird icon in the dock, appears on the top left of the screen like frozen : you can do nothing with it and you cannot hide it until you close the session. I join a screenshot Ubuntu 21.04 WAYLAND (64 bits) Thunderbird 78.11 ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: thunderbird 1:78.11.0+build1-0ubuntu0.21.04.2 ProcVersionSignature: Ubuntu 5.11.0-22.23-generic 5.11.21 Uname: Linux 5.11.0-22-generic x86_64 ApportVersion: 2.20.11-0ubuntu65.1 Architecture: amd64 BuildID: 20210528153351 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Thu Jul 15 15:42:15 2021 IncompatibleExtensions: Lightning - {e2fda1a4-762b-4020-b5ad-a41df1933103} Français Language Pack - [email protected] English (GB) Language Pack - [email protected] Thunderbird (default) - {972ce4c6-7e08-4474-a285-3208198ce6fd} InstallationDate: Installed on 2020-04-10 (461 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402) PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/thunderbird/omni.ja:greprefs.js:732 PrefSources: prefs.js Profiles: Profile0 (Default) - LastVersion=78.11.0/20210528153351 (In use) SourcePackage: thunderbird UpgradeStatus: Upgraded to hirsute on 2021-04-26 (79 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1936393/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

