diff --git a/b2g/app/b2g.js b/b2g/app/b2g.js
index 0acb803177ce..a19b85191f21 100644
--- a/b2g/app/b2g.js
+++ b/b2g/app/b2g.js
@@ -353,9 +353,6 @@ pref("urlclassifier.gethashtables", "goog-phish-shavar,goog-malware-shavar");
 // the database.
 pref("urlclassifier.confirm-age", 2700);
 
-// Maximum size of the sqlite3 cache during an update, in bytes
-pref("urlclassifier.updatecachemax", 4194304);
-
 // URL for checking the reason for a malware warning.
 pref("browser.safebrowsing.malware.reportURL", "http://safebrowsing.clients.google.com/safebrowsing/diagnostic?client=%NAME%&hl=%LOCALE%&site=");
 #endif
diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index 49946f5f9e32..419742d16518 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -759,12 +759,6 @@ pref("urlclassifier.gethashtables", "goog-phish-shavar,goog-malware-shavar");
 // the database.
 pref("urlclassifier.confirm-age", 2700);
 
-// Maximum size of the sqlite3 cache during an update, in bytes
-pref("urlclassifier.updatecachemax", 41943040);
-
-// Maximum size of the sqlite3 cache for lookups, in bytes
-pref("urlclassifier.lookupcachemax", 1048576);
-
 // URL for checking the reason for a malware warning.
 pref("browser.safebrowsing.malware.reportURL", "http://safebrowsing.clients.google.com/safebrowsing/diagnostic?client=%NAME%&hl=%LOCALE%&site=");
 
diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index 3dfb834db005..901f1ae75fb7 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -662,9 +662,6 @@ pref("urlclassifier.gethashtables", "goog-phish-shavar,goog-malware-shavar");
 // the database.
 pref("urlclassifier.confirm-age", 2700);
 
-// Maximum size of the sqlite3 cache during an update, in bytes
-pref("urlclassifier.updatecachemax", 4194304);
-
 // URL for checking the reason for a malware warning.
 pref("browser.safebrowsing.malware.reportURL", "http://safebrowsing.clients.google.com/safebrowsing/diagnostic?client=%NAME%&hl=%LOCALE%&site=");
 #endif
diff --git a/mobile/xul/app/mobile.js b/mobile/xul/app/mobile.js
index 099f6327c21d..1f9d6bc6a31a 100644
--- a/mobile/xul/app/mobile.js
+++ b/mobile/xul/app/mobile.js
@@ -663,9 +663,6 @@ pref("urlclassifier.gethashtables", "goog-phish-shavar,goog-malware-shavar");
 // the database.
 pref("urlclassifier.confirm-age", 2700);
 
-// Maximum size of the sqlite3 cache during an update, in bytes
-pref("urlclassifier.updatecachemax", 4194304);
-
 // URL for checking the reason for a malware warning.
 pref("browser.safebrowsing.malware.reportURL", "http://safebrowsing.clients.google.com/safebrowsing/diagnostic?client=%NAME%&hl=%LOCALE%&site=");
 #endif