diff --git a/b2g/app/b2g.js b/b2g/app/b2g.js
index 3999662ed59..83ba70321dc 100644
--- a/b2g/app/b2g.js
+++ b/b2g/app/b2g.js
@@ -83,12 +83,6 @@ pref("browser.download.manager.focusWhenStarting", false);
 pref("browser.download.manager.flashCount", 2);
 pref("browser.download.manager.displayedHistoryDays", 7);
 
-/* download alerts (disabled above) */
-pref("alerts.slideIncrement", 1);
-pref("alerts.slideIncrementTime", 10);
-pref("alerts.totalOpenTime", 6000);
-pref("alerts.height", 50);
-
 /* download helper */
 pref("browser.helperApps.deleteTempFileOnExit", false);
 
diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index a059dbf68fa..2d089105f0e 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -128,12 +128,6 @@ pref("browser.download.manager.focusWhenStarting", false);
 pref("browser.download.manager.flashCount", 2);
 pref("browser.download.manager.displayedHistoryDays", 7);
 
-/* download alerts (disabled above) */
-pref("alerts.slideIncrement", 1);
-pref("alerts.slideIncrementTime", 10);
-pref("alerts.totalOpenTime", 6000);
-pref("alerts.height", 50);
-
 /* download helper */
 pref("browser.helperApps.deleteTempFileOnExit", false);
 
diff --git a/mobile/xul/app/mobile.js b/mobile/xul/app/mobile.js
index eb87df53bef..779a6c28309 100644
--- a/mobile/xul/app/mobile.js
+++ b/mobile/xul/app/mobile.js
@@ -134,10 +134,7 @@ pref("browser.download.manager.flashCount", 2);
 pref("browser.download.manager.displayedHistoryDays", 7);
 
 /* download alerts (disabled above) */
-pref("alerts.slideIncrement", 1);
-pref("alerts.slideIncrementTime", 10);
 pref("alerts.totalOpenTime", 6000);
-pref("alerts.height", 50);
 
 /* download helper */
 pref("browser.helperApps.deleteTempFileOnExit", false);