This bug was fixed in the package thunderbird - 1:78.7.1+build1-0ubuntu0.20.04.1

---------------
thunderbird (1:78.7.1+build1-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream stable release (78.7.1build1)

  * debian/control{,.in}: remove the "Replaces: tinyjsd" declaration, the
    versioned Breaks is enough to ensure a clean upgrade

thunderbird (1:78.7.0+build2-0ubuntu0.20.04.4) focal; urgency=medium

  * No-change rebuild to make sure all the relevant changelog entries are
    included in the uploaded changes file.

thunderbird (1:78.7.0+build2-0ubuntu0.20.04.3) focal; urgency=medium

  * debian/control{,.in}: add missing epoch in the versioned Breaks on enigmail

thunderbird (1:78.7.0+build2-0ubuntu0.20.04.2) focal; urgency=medium

  * debian/control{,.in}:
    - add a versioned break on enigmail << 2.2
    - version the break on jsunit << 0.2.2-2ubuntu1
    - version the break on tinyjsd << 1.2+git1-1ubuntu1

thunderbird (1:78.7.0+build2-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream stable release (78.7.0build2)

thunderbird (1:78.6.1+build1-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream stable release (78.6.1build1)

  * Update cbindgen to 0.16.0

thunderbird (1:78.5.1+build1-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream stable release (78.5.1build1)

thunderbird (1:78.5.0+build3-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream stable release (78.5.0build3)

  * Allow the use of external GPG keyrings by default
    - debian/vendor.js

thunderbird (1:78.4.2+build1-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream stable release (78.4.2build1)

  * Remove the deprecated --enable-calendar configure option
    - debian/config/mozconfig.in

thunderbird (1:78.3.2+build1-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream stable release (78.3.2build1)

thunderbird (1:78.3.1+build1-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream stable release (78.3.1build1) (LP: #1895643)
    - debian/config/branch.mk
  * Bump build dependency on rustc >= 1.41.0 and cargo >= 0.42
    - debian/control{,.in}
  * Bump build dependency on nodejs >= 10.21
    - debian/control{,.in}
  * Bump build dependency on nasm >= 2.14.02
    - debian/control{,.in}
  * Bump build dependency on debhelper >= 9
    - debian/compat
    - debian/control{,.in}
  * Port packaging to python3
    - debian/build/Expression.py
    - debian/build/Preprocessor.py
    - debian/build/create-tarball.py
    - debian/build/fix-mozinfo-appname.py
    - debian/build/keepalive-wrapper.py
    - debian/build/rules.mk
    - debian/build/xpi-id.py
    - debian/control{,.in}
  * Clean up unused code paths in packaging rules
    - debian/rules
    - debian/build/config.mk
    - debian/config/mozconfig.in
  * Update cbindgen to 0.14.3
    - debian/build/create-tarball.py
  * Build required icudt67b.dat on s390x with /usr/sbin/icupkg
    - debian/build/rules.mk
    - debian/control{,.in}
  * Do not use system-wide sqlite3
    - debian/config/mozconfig.in
    - debian/control{,.in}
  * Work around clang hanging forever when trying to optimize the build of the
    embedded copy of sqlite3 (LP: #1878292)
    - debian/patches/s390x-workaround-sqlite3-clang-optimization-hang.patch
  * Remove obsolete config options
    - debian/config/mozconfig.in
  * Allow sideloading langpacks (LP: #1866059)
    - debian/config/mozconfig.in
  * Make xul-ext-lightning a transitional empty package, now that calendar
    functionality is part of the Thunderbird core
    - debian/build/rules.mk
    - debian/control{,.in}
    - debian/rules
  * Separately installed blocklist.xml was removed
    - debian/thunderbird.install.in
  * Install WeTransfer extension to the features directory
    - debian/thunderbird.install.in
  * Add the following locales: af, en-CA, fa, ja-JP-mac, pa-IN, th
    - update debian/config/locales.{all,shipped}
  * Remove upstreamed patch
    - debian/patches/nss_disable_fips_enabled_flag.patch
  * Update and rename patch to selectively reduce debug info level
    - debian/patches/reduce-rust-debuginfo-on-selected-architectures.patch
  * Refresh patches
    - debian/patches/rust-drop-dll-checksums.patch
    - debian/patches/support-coinstallable-trunk-build.patch
  * Drop armel arch references
    - debian/control{,.in}
    - debian/build/rules.mk
  * Add generic logic to target different LLVM toolchains
    - debian/config/mozconfig.in
    - debian/control{,.in}
    - debian/build/rules.mk
  * Make thunderbird suggest libotr5
    - debian/control{,.in}
  * Mark thunderbird as breaking tinyjsd and jsunit, and replacing tinyjsd,
    to ensure these packages are removed when upgrading
    - debian/control{,.in}

 -- Olivier Tilloy <email address hidden>  Mon, 08 Feb 2021 15:50:35 +0100