Same as Firefox is doing. I just closed a window with like 10 tabs and have no way to get it back... This is quite annoying...
You had multiple windows open ?
Severity: normal → major
Component: Toolbars and Tabs → Mail Window Front End
Summary: Thunderbird should warn when the user is trying to close a window with more than one tab → Thunderbird should warn when user closes main 3-pane window with more than one tab, and not last window
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