--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1678,17 +1678,17 @@ pref("network.http.enforce-framing.soft"
 // the network will exist in header array as empty string. Call SetHeader with
 // an empty value will still delete the header.(Bug 6699259)
 pref("network.http.keep_empty_response_headers_as_empty_string", true);
 
 // Max size, in bytes, for received HTTP response header.
 pref("network.http.max_response_header_size", 393216);
 
 // If we should attempt to race the cache and network
-pref("network.http.rcwn.enabled", true);
+pref("network.http.rcwn.enabled", false);
 pref("network.http.rcwn.cache_queue_normal_threshold", 8);
 pref("network.http.rcwn.cache_queue_priority_threshold", 2);
 // We might attempt to race the cache with the network only if a resource
 // is smaller than this size.
 pref("network.http.rcwn.small_resource_size_kb", 256);
 
 // The ratio of the transaction count for the focused window and the count of
 // all available active connections.