diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index eb50c1a23bbb..bf6b37a1db84 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1556,7 +1556,7 @@ pref("network.http.signed-packages.enabled", false);
 // array - behavior as it used to be. If it is true: empty headers coming from
 // 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", false);
+pref("network.http.keep_empty_response_headers_as_empty_string", true);
 
 // default values for FTP
 // in a DSCP environment this should be 40 (0x28, or AF11), per RFC-4594,
diff --git a/testing/web-platform/meta/XMLHttpRequest/getresponseheader-cookies-and-more.htm.ini b/testing/web-platform/meta/XMLHttpRequest/getresponseheader-cookies-and-more.htm.ini
deleted file mode 100644
index ac060491c369..000000000000
--- a/testing/web-platform/meta/XMLHttpRequest/getresponseheader-cookies-and-more.htm.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[getresponseheader-cookies-and-more.htm]
-  type: testharness
-  [XMLHttpRequest: getResponseHeader() custom/non-existent headers and cookies]
-    expected: FAIL
-