diff --git a/conf/librewolf.overrides.cfg b/conf/librewolf.overrides.cfg
index ecfa0aae..ab130e0d 100644
--- a/conf/librewolf.overrides.cfg
+++ b/conf/librewolf.overrides.cfg
@@ -38,6 +38,14 @@ pref("privacy.fingerprintingProtection.pbmode", true);
 // usability. https://searchfox.org/mozilla-central/source/toolkit/components/resistfingerprinting/RFPTargets.inc
 pref("privacy.fingerprintingProtection.overrides", "+AllTargets,-KeyboardEvents,-SpeechSynthesis,-CSSPrefersColorScheme,-CSSPrefersReducedMotion,-JSDateTimeUTC");
 
+// No JavaScript allowed in internal pdf viewer
+pref("pdfjs.enableScripting", false);
+
+// Dark mode
+pref("ui.systemUsesDarkTheme", 1);
+pref("prefers-color-scheme", "dark");
+pref("pdfjs.viewerCssTheme", 2);
+
 // Enable Firefox accounts
 pref("identity.fxaccounts.enabled", true);
 
@@ -191,8 +199,6 @@ pref("permissions.manager.defaultsUrl", ""); // revoke special permissions for s
 
 // Aminda stripped safebrowsing here as even in LibreWolf filtering DNS is used + the extensions.
 
-pref("pdfjs.enableScripting", false); // disable js scripting in the built-in pdf reader
-
 pref("geo.provider.network.url", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
 // Although I doubt they will improve accuracy, why not?
 pref("geo.provider.use_gpsd", true); // [LINUX]