Package: xul-ext-compactheader Version: 2.1.6-1 Severity: grave The plugin is broken with Thunderbird 60 in stretch and sid, after installation it's disabled and only prints "CompactHeader is incompatible with Thunderbird 60.4". Either the version from sid could be backported or alternatively the extension could be removed from stable by the next point release.
Cheers,
Moritz
