diff --git a/conf/librewolf.overrides.cfg b/conf/librewolf.overrides.cfg
index 7192fc25..4f991a7b 100644
--- a/conf/librewolf.overrides.cfg
+++ b/conf/librewolf.overrides.cfg
@@ -74,9 +74,9 @@ defaultPref("intl.accept_languages", "fi, en");
 //pref("pdfjs.enableScripting", false);
 
 // Dark mode
-pref("ui.systemUsesDarkTheme", 1);
+//pref("ui.systemUsesDarkTheme", 1);
 pref("prefers-color-scheme", "dark");
-pref("pdfjs.viewerCssTheme", 2);
+//pref("pdfjs.viewerCssTheme", 2);
 
 // Enable Firefox accounts
 pref("identity.fxaccounts.enabled", true);
diff --git a/etc/firefox/policies/policies.json b/etc/firefox/policies/policies.json
index 1756f8be..c0b2f381 100644
--- a/etc/firefox/policies/policies.json
+++ b/etc/firefox/policies/policies.json
@@ -331,6 +331,11 @@
         "Type": "boolean",
         "Value": false
       },
+      "pdfjs.viewerCssTheme": {
+        "Status": "default",
+        "Type": "number",
+        "Value": 2
+      },
       "privacy.userContext.enabled": {
         "Status": "locked",
         "Type": "boolean",
@@ -360,6 +365,11 @@
         "Status": "locked",
         "Type": "boolean",
         "Value": true
+      },
+      "ui.systemUsesDarkTheme": {
+        "Status": "default",
+        "Type": "number",
+        "Value": 1
       }
     },
     "SearchEngines": {