Package: thunderbird
Version: 1:78.11.0-1
Severity: grave
Justification: renders package unusable

Dear Maintainer,

Since the update to 78.11.0 Thunderbird cannot load various webpages. To
reproduce the error, try to do a search in the Add-ons Manager (type
something in the search box and press Enter).

The error message is

"The website tried to negotiate an inadequate level of security.
...
Error code: NS_ERROR_NET_INADEQUATE_SECURITY"

There is perhaps a more useful error message in the error console:

addons.thunderbird.net : server does not support RFC 5746, see CVE-2009-3555

The problem also appears when trying to load other pages or using
certain add-ons (for example, calendar-google-provider).

The problem goes away if one sets network.http.spdy.enforce-tls-profile
to false in the preferences. This makes me think that there is an issue
with the TLS library.

Cheers,
Todor



-- System Information:
Debian Release: 11.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-7-amd64 (SMP w/4 CPU threads)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), LANGUAGE
not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages thunderbird depends on:
ii  debianutils          4.11.2
ii  fontconfig           2.13.1-4.2
ii  libatk1.0-0          2.36.0-2
ii  libbotan-2-17        2.17.3+dfsg-2
ii  libbz2-1.0           1.0.8-4
ii  libc6                2.31-12
ii  libcairo-gobject2    1.16.0-5
ii  libcairo2            1.16.0-5
ii  libdbus-1-3          1.12.20-2
ii  libdbus-glib-1-2     0.110-6
ii  libevent-2.1-7       2.1.12-stable-1
ii  libffi7              3.3-6
ii  libfontconfig1       2.13.1-4.2
ii  libfreetype6         2.10.4+dfsg-1
ii  libgcc-s1            10.2.1-6
ii  libgdk-pixbuf-2.0-0  2.42.2+dfsg-1
ii  libglib2.0-0         2.66.8-1
ii  libgtk-3-0           3.24.24-4
ii  libicu67             67.1-6
ii  libjson-c5           0.15-2
ii  libnspr4             2:4.29-1
ii  libnss3              2:3.61-1
ii  libpango-1.0-0       1.46.2-3
ii  libstdc++6           10.2.1-6
ii  libvpx6              1.9.0-1
ii  libx11-6             2:1.7.1-1
ii  libx11-xcb1          2:1.7.1-1
ii  libxcb-shm0          1.14-3
ii  libxcb1              1.14-3
ii  libxext6             2:1.3.3-1.1
ii  libxrender1          1:0.9.10-1
ii  psmisc               23.4-2
ii  x11-utils            7.7+5
ii  zlib1g               1:1.2.11.dfsg-2

Versions of packages thunderbird recommends:
ii  hunspell-bg [hunspell-dictionary]            1:7.1.0~rc3-3
ii  hunspell-en-gb [hunspell-dictionary]         1:7.1.0~rc3-3
ii  hunspell-en-us [hunspell-dictionary]         1:2019.10.06-1
ii  hunspell-fr-classical [hunspell-dictionary]  1:7.0-1

Versions of packages thunderbird suggests:
ii  apparmor          2.13.6-10
ii  fonts-lyx         2.3.6-1
ii  libgssapi-krb5-2  1.18.3-5
ii  libgtk2.0-0       2.24.33-2

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