Enable the feature-11712-thunderbird APT overlay.
This will install thunderbird 1:45.8.0-3+tails2 built for amd64 on Debian Stretch. Naturally it is a first step for the Icedove → Thunderbird migration as well. And this package contains an AppArmor profile (unlike the Debian Jessie package). Refs: #12242 Will-fix: #11712, #11973 These packages also has the patch from the following upstream ticket applied: https://bugzilla.mozilla.org/show_bug.cgi?id=1281959 We enable browser.download.forbid_open_with so the "Open with..." option is hidden in the attachment download dialog, since Thunderbird's AppArmor profile does not allow starting applications in Tails. Refs: #11964