Bug 1566785 - Port
bug 1565051: Enable 'browser.in-content.dark-mode' by default. r=aleca
--- a/mail/app/profile/all-thunderbird.js
+++ b/mail/app/profile/all-thunderbird.js
@@ -780,9 +780,9 @@ pref("intl.regional_prefs.use_os_locales
// Multi-lingual preferences
pref("intl.multilingual.enabled", false);
// We don't support yet language pack download from ATN
pref("intl.multilingual.downloadEnabled", false);
// Dark in-content pages
-pref("browser.in-content.dark-mode", false);
+pref("browser.in-content.dark-mode", true);