How to re-enable the prompt confirmation shift + delete?

I don't like play with trash / recycling bins and have always used the shift + del for everything in Windows and other programs that support it. This includes Thunderbird. I think that I recently accidentally ticked the box 'don't show this again' on this guest recently, as it was not to ask me if I'm sure that in recent times. I don't want that he ask me, and when it isn't, I instinctively to the trash in case I missed the SHIFT key, but twice this morning, I had this happened and find the empty basket. I am running version 31.4.0 and have not recently changed all the extensions, I run the following:
Clean the subject 4.0.3
Change the subject of the e-mail 2.0.3
EditSender 0.3
ImportExportTools 3.1
3.3.1 lightning
Show all parts of the body 1.2

None of them seem likely to be associated with that, and I've been through the screen of options several times without finding something that seems likely to be related. Note that I'm sever "Local Folders" and there are very few parameters for this special folder in account settings, but it doesn't seem to be a reset there, either. How can I reset this prompt?

modify prefs.js with tools/alternativ / advanced / common (first Rabat) / config-utility-button.

change
mail.warn_on_shift_delete; false
true

Tags: Thunderbird

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