setting: warn before deleting trash
I used to get warnings before I could delete a message from 'trash' but recently I found the warning is missing so I permanently deleted something I was reading in the trash folder. Is this option still available? How do I turn it on?
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There are two things to consider: if you don't get a confirmation dialog when emptying Trash, there is a preference that controls that.
To have a confirmation for deleting specific messages, use the ConfirmBeforeDelete add-on (see picture).
https://support.mozilla.org/en-US/kb/installing-addon-thunderbird