Linden Lab added this feature to their viewer and the new release of Firestorm which you are using now also has this feature. To be honest, this feature hasn't been very popular among Firestorm users, which we guessed it wouldn't be before we released, so we added a way for you to disable it  If you wish to stop group notice attachments cluttering up your trash folder on Firestorm, please do the following: Activate the Advanced menu in the top menu bar of the viewer using CTRL+ALT+
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