Confirm before exit or quitting the application

[forrie]

I am posting this in context of the new version of Thunderbird.  There have been requests for this in thepast, which I presume have gone ignored.

Having a confirm-before-quit option would be very helpful.  Other applications have already adopted this some time ago; Mozilla Firefox does it.   Particularly, on MacOS, it's easy to fat-finger CMD+Q vs CMD+W (close window). 

Is there a good reason why this isn't an option now in Thunderbird or why it hasn't been considered?  Is it complicated to implement?

[Jon]

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