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Bug 1559448 Comment 22 Edit History
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Maybe this bug and bug 1664586 (TB tray notification) are connected together: bp-90114848-75e0-4730-8653-c81a00201119 85.0a1 (2020-11-19) (64-bit) => open Activity Manager => write Mail to own IMAP => close TB main window => Activity Manager didn't close, TaskSymbol "new Mail" stay visible => crash happen after closing Activity Manager window "new Mail" symbol is shown in taskbar Foreach TB close crash (while having new Mail) there is a living "new mail" notification icon in Windows 10 20H2 64bit