diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index abe3baffcff..b7257f5bc57 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -108,6 +108,9 @@ pref("browser.cache.offline.capacity", 5120); // kilobytes
 pref("offline-apps.quota.max", 2048); // kilobytes
 pref("offline-apps.quota.warn", 1024); // kilobytes
 
+// cache compression turned off for now - see bug #715198
+pref("browser.cache.compression_level", 0);
+
 /* protocol warning prefs */
 pref("network.protocol-handler.warn-external.tel", false);
 pref("network.protocol-handler.warn-external.mailto", false);
diff --git a/mobile/xul/app/mobile.js b/mobile/xul/app/mobile.js
index 3d713a9e1b5..2c9ce2bdac2 100644
--- a/mobile/xul/app/mobile.js
+++ b/mobile/xul/app/mobile.js
@@ -106,8 +106,8 @@ pref("browser.cache.offline.capacity", 5120); // kilobytes
 pref("offline-apps.quota.max", 2048); // kilobytes
 pref("offline-apps.quota.warn", 1024); // kilobytes
 
-/* zlib compression level used for cache compression */
-pref("browser.cache.compression_level", 1);
+// cache compression turned off for now - see bug #715198
+pref("browser.cache.compression_level", 0);
 
 /* protocol warning prefs */
 pref("network.protocol-handler.warn-external.tel", false);
diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index 34c83226296..f3ab738f497 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -96,7 +96,8 @@ pref("offline-apps.quota.warn",        51200);
 // 0 => disable compression
 // 1 => best speed
 // 9 => best compression
-pref("browser.cache.compression_level", 5);
+// cache compression turned off for now - see bug #715198
+pref("browser.cache.compression_level", 0);
 
 // Whether or not indexedDB is enabled.
 pref("dom.indexedDB.enabled", true);