To whom it may concern, Hi, my name is ashim roy. i think i may have found a serious security flaw in thunderbird master password for locking and unlocking the app. i can open the app, access all the emails, change settings. passwords, even see the passwords for all my emails without trying a single masterpassword. when you click the thunderbird icon to open the app the masterpassword prompt pops up asking for the password, all you have to do is click cancel and it opens up the app. you can click on any email again it will ask for the master password just click cancel and you will have access to all the emails. sometime it asks you two or three times for the password when you click something but it doesn't matter just click cancel and continue with your task. It beast the whole purpose of the master password when anybody can just have access to your emails, passwords, your contact lists, everything. the thunderbird version 78.13.0(64-bit), OS Name: Ubuntu 21.04, OS Type:(64-bit), GNOME Version: 3.38.5, Windowing System: Wayland