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Upgrade to Thunderbird 78 ESR
Originally created by @intrigeri on #17148 (Redmine)
Thunderbird 78 should be released during the week of 2020-07-06; Thunderbird 68 should become EOL on 2020-09-22, which will be our deadline for upgrading to v78. This should also be the time when built-in OpenPGP support gets enabled by default in Thunderbird 78.2 (#17147).
The two Thunderbird patches we created to replace TorBirdy were upstreamed (#17283 (closed)) and should be part of Thunderbird 78, so they can be dropped from the patches we apply on top. Those are:
config/chroot_local-includes/usr/share/tails/build/thunderbird-patches/Avoid-local-timestamp-disclosure-in-Date-header.patchconfig/chroot_local-includes/usr/share/tails/build/thunderbird-patches/Avoid-spellchecking-language-disclosure-in-Content-Language-header.patch
In the upstream patches, the pref mail.mime.avoid_fingerprinting was
split into two new prefs, which have to be enabled instead:
mail.suppress_content_languagemail.sanitize_date_header