diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index ed2ce8c01a73..6e96eddb4a20 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -60,7 +60,7 @@ pref("browser.bookmarks.max_backups",       5);
 
 pref("browser.cache.disk.enable",           true);
 #ifndef WINCE
-pref("browser.cache.disk.capacity",         51200);
+pref("browser.cache.disk.capacity",         256000);
 #else
 pref("browser.cache.disk.capacity",         20000);
 #endif
diff --git a/netwerk/cache/nsCacheService.cpp b/netwerk/cache/nsCacheService.cpp
index dc39d3983fcc..3dba6a066f03 100644
--- a/netwerk/cache/nsCacheService.cpp
+++ b/netwerk/cache/nsCacheService.cpp
@@ -86,7 +86,7 @@
 #define DISK_CACHE_DIR_PREF         "browser.cache.disk.parent_directory"
 #define DISK_CACHE_CAPACITY_PREF    "browser.cache.disk.capacity"
 #define DISK_CACHE_MAX_ENTRY_SIZE_PREF "browser.cache.disk.max_entry_size"
-#define DISK_CACHE_CAPACITY         51200
+#define DISK_CACHE_CAPACITY         256000
 
 #define OFFLINE_CACHE_ENABLE_PREF   "browser.cache.offline.enable"
 #define OFFLINE_CACHE_DIR_PREF      "browser.cache.offline.parent_directory"