diff --git a/content/_lib.js b/content/_lib.js
index 431d0df..1e554ef 100644
--- a/content/_lib.js
+++ b/content/_lib.js
@@ -569,7 +569,7 @@ function aios_setTargets() {
 
 
     // Oeffnen des Download-Fensters verhindern, wenn die Sidebar genutzt werden soll
-    if(AiOS_HELPER.prefBranchAiOS.getBoolPref('dm.sidebar')) AiOS_HELPER.prefService.setBoolPref("browser.download.manager.showWhenStarting", false);
+    if(AiOS_HELPER.prefBranchAiOS.getBoolPref('dm.sidebar')) AiOS_HELPER.prefBranchAiOS.setBoolPref("browser.download.manager.showWhenStarting", false);
 
 
     // Download-Observer hinzufuegen, falls Downloads in der Sidebar geoeffnet werden sollen
diff --git a/content/prefs/prefs.js b/content/prefs/prefs.js
index 9b00d92..bffc33e 100644
--- a/content/prefs/prefs.js
+++ b/content/prefs/prefs.js
@@ -548,13 +548,13 @@ function aios_applyPrefs() {
 
         switch(pType) {
             case "string":
-                AiOS_HELPER.prefService.setCharPref(pName, pValue);
+                AiOS_HELPER.prefBranchAiOS.setCharPref(pName, pValue);
                 break;
             case "bool":
-                AiOS_HELPER.prefService.setBoolPref(pName, pValue);
+                AiOS_HELPER.prefBranchAiOS.setBoolPref(pName, pValue);
                 break;
             case "int":
-                AiOS_HELPER.prefService.setIntPref(pName, pValue);
+                AiOS_HELPER.prefBranchAiOS.setIntPref(pName, pValue);
                 break;
         }
     }