thunderbird/thunderbird-redhat-default-prefs.js

pref("app.update.enabled", false);
pref("app.update.autoInstallEnabled", false);
/* Allow users to set custom colors*/
/* pref("browser.display.use_system_colors",   true);*/
pref("general.useragent.vendor", "Red Hat");
pref("general.useragent.vendorSub", "THUNDERBIRD_RPM_VR");
pref("intl.locale.matchOS", true);
pref("mail.shell.checkDefaultClient", false);
pref("toolkit.networkmanager.disable", false);
pref("offline.autoDetect", true);

/* Disable global indexing by default*/
pref("mailnews.database.global.indexer.enabled", false);

/* Do not switch to Smart Folders after upgrade to 3.0b4 */
pref("mail.folder.views.version", "1");
pref("extensions.shownSelectionUI", true);
pref("extensions.autoDisableScopes", 0);

/* For rhbz#1024232 */
pref("ui.SpellCheckerUnderlineStyle",       1);

/* Workaround for rhbz#1753011 */
pref("spellchecker.dictionary_path", "/usr/share/myspell");
/* Workaround for rhbz#1134876 */
pref("javascript.options.baselinejit",      false);
/* Workaround for rhbz#1110291 */
pref("network.negotiate-auth.allow-insecure-ntlm-v1", true);
/* Workaround for mozbz#1063315 */
pref("security.use_mozillapkix_verification", false);
/* Use OS settings for UI language */
pref("intl.locale.requested", "");
/* Disable telemetry */
pref("datareporting.healthreport.uploadEnabled", false);
pref("datareporting.policy.dataSubmissionEnabled", false);
pref("toolkit.telemetry.archive.enabled", false);
/* ECH is not supported in the system nss */
pref("security.tls.ech.grease_probability", 0);