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

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