i wish to restart an old closed thread here https://support.mozilla.org/it/questions/1181468 i quote the solution by Toad-Hall "To have a confirmation prompt for deleting messages, use this add-on: https://freeshell.de/~kaosmos/index-en.html#cbd" unfortunately, this solution is no longer valid because from version 60.2 or 60.3 this add-on is no more supported in TB, and kaosmos says: "What about Thunderbird extensions? At present it's not clear yet if Thunderbird XUL/XPCOM-based add-ons will have the same destiny of Firefox add-ons. If Thunderbid in future will go on sharing the most part of its core code with Firefox, XUL/XPCOM-based add-ons will be banned on Thunderbird too. Personally I think that this will end up to happen sooner or later, but now nobody can say what will happen to Thunderbird development in future. So, for the moment I will go on mantaining and supporting Thunderbird add-ons as far as I can. Of course I will not add new features or write new extensions, because this could be a waste of time if also Thunderbird XUL/XPCOM-based add-ons will be banned." so, i think CONFIRMBEFOREDELETE extension is a closed discussion... the problem is still on the table, because i (and million of people i think...) have thousands of messages in trash folder and surely i don't want to waste my time searching in such folder every day to control if i have accidentally deleted some messages...this happened sometimes due to a mistake, and this behaviour of TB is really annoying. say, force users to install an extension to ask a confirmation before deleting something (anything...contacts, folders, servers and so on) is ridiculous and a little bit sadistic, if i can afford it. so, i think will be better to insert the confirm before delete (anything) in the bug report, in a way to solve the problem definitively. if i can contribute, please tell me how... regards.