Thunderbird Hardening

etc/thunderbird/pref/40_security-misc.js

@@ -0,0 +1,59 @@
+//#### Copyright (C) 2019 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
+//#### See the file COPYING for copying conditions.
+
+//#### meta start
+//#### project Whonix and Kicksecure
+//#### category security and apps
+//#### description https://forums.whonix.org/t/enable-network-idn-show-punycode-by-default-in-thunderbird-to-fix-url-not-showing-real-domain-name-homograph-attack-punycode/8415
+//#### meta end
+
+// https://forums.whonix.org/t/enable-network-idn-show-punycode-by-default-in-thunderbird-to-fix-url-not-showing-real-domain-name-homograph-attack-punycode/8415
+pref("network.IDN_show_punycode", true);
+
+// Disable all and any kind of telemetry by default
+pref("toolkit.telemetry.enabled", false);
+pref("toolkit.telemetry.unified", false);
+pref("toolkit.telemetry.shutdownPingSender.enabled", false);
+pref("toolkit.telemetry.updatePing.enabled", false);
+pref("toolkit.telemetry.archive.enabled", false);
+pref("toolkit.telemetry.bhrPing.enabled", false);
+pref("toolkit.telemetry.firstShutdownPing.enabled", false);
+pref("toolkit.telemetry.newProfilePing.enabled", false);
+pref("toolkit.telemetry.server", ""); // Defense in depth
+pref("toolkit.telemetry.server_owner", ""); // Defense in depth
+pref("datareporting.healthreport.uploadEnabled", false);
+pref("datareporting.policy.dataSubmissionEnabled", false);
+pref("toolkit.telemetry.coverage.opt-out", true); // from Firefox
+pref("toolkit.coverage.opt-out", true); // from Firefox
+
+// Disable implicit outbound traffic
+pref("network.connectivity-service.enabled", false);
+pref("network.prefetch-next", false);
+pref("network.dns.disablePrefetch", true);
+pref("network.predictor.enabled", false);
+
+// No need to explain the problems with javascript
+// If you want javascript, use your browser
+// Thunderbird needs no javascript
+// pref("javascript.enabled", false); // Will break setting up services that require redirecting to their javascripted webpage for login, like gmail etc. So commented out for now.
+
+// Disable scripting when viewing pdf files
+user_pref("pdfjs.enableScripting", false);
+
+// If you want cookies, use your browser
+pref("network.cookie.cookieBehavior", 2);
+
+// Do not send user agent information
+// For email clients, this is more like a relic of the past
+// Completely not necessary and just exposes a lot of information about the client
+// Since v115.0 Thunderbird already minimizes the user agent
+// But we want it gone for good for no information leak at all
+// https://hg.mozilla.org/comm-central/rev/cbbbc8d93cd7
+pref("mailnews.headers.sendUserAgent", false);
+
+// Normally we send emails after marking them with a time stamp
+// That includes our local time zone
+// This option makes our local time zone appear as UTC
+// And rounds the time stamp to the closes minute
+// https://hg.mozilla.org/comm-central/rev/98aa0bf2e719
+pref("mail.sanitize_date_header", true);