Source: imap-acl-extension Severity: grave When installing the plugin on Thunderbird 60, it's disabled and only prints "IMAP-ACL-Extension is incompatible with Thunderbird 60.3" on stretch and sid.
TB 60 was uploaded to stretch two months ago (and three months ago to sid), given that noone filed a bug so far, it makes me wonder whether this package is used at all... Cheers, Moritz