diff --git a/netwerk/test/unit/test_cache2-30a-entry-pinning.js b/netwerk/test/unit/test_cache2-30a-entry-pinning.js
index ace537884f5c..3a5db421aa96 100644
--- a/netwerk/test/unit/test_cache2-30a-entry-pinning.js
+++ b/netwerk/test/unit/test_cache2-30a-entry-pinning.js
@@ -1,6 +1,10 @@
 function run_test()
 {
   do_get_profile();
+  if (!newCacheBackEndUsed()) {
+    do_check_true(true, "This test checks only cache2 specific behavior.");
+    return;
+  }
 
   // Open for write, write
   asyncOpenCacheEntry("http://a/", "pin", Ci.nsICacheStorage.OPEN_TRUNCATE, LoadContextInfo.default,
diff --git a/netwerk/test/unit/test_cache2-30b-pinning-storage-clear.js b/netwerk/test/unit/test_cache2-30b-pinning-storage-clear.js
index 617697a8fa70..a9410ff75723 100644
--- a/netwerk/test/unit/test_cache2-30b-pinning-storage-clear.js
+++ b/netwerk/test/unit/test_cache2-30b-pinning-storage-clear.js
@@ -1,6 +1,10 @@
 function run_test()
 {
   do_get_profile();
+  if (!newCacheBackEndUsed()) {
+    do_check_true(true, "This test checks only cache2 specific behavior.");
+    return;
+  }
   var lci = LoadContextInfo.default;
 
   // Open a pinned entry for write, write
diff --git a/netwerk/test/unit/test_cache2-30c-pinning-deferred-doom.js b/netwerk/test/unit/test_cache2-30c-pinning-deferred-doom.js
index 657e96798e3b..91c621ce5958 100644
--- a/netwerk/test/unit/test_cache2-30c-pinning-deferred-doom.js
+++ b/netwerk/test/unit/test_cache2-30c-pinning-deferred-doom.js
@@ -26,6 +26,11 @@ function log_(msg) { if (true) dump(">>>>>>>>>>>>> " + msg + "\n"); }
 function run_test()
 {
   do_get_profile();
+  if (!newCacheBackEndUsed()) {
+    do_check_true(true, "This test checks only cache2 specific behavior.");
+    return;
+  }
+
   var lci = LoadContextInfo.default;
   var testingInterface = get_cache_service().QueryInterface(Ci.nsICacheTesting);
   do_check_true(testingInterface);
diff --git a/netwerk/test/unit/test_cache2-30d-pinning-WasEvicted-API.js b/netwerk/test/unit/test_cache2-30d-pinning-WasEvicted-API.js
index 1dad338214f1..c0da115aa5a4 100644
--- a/netwerk/test/unit/test_cache2-30d-pinning-WasEvicted-API.js
+++ b/netwerk/test/unit/test_cache2-30d-pinning-WasEvicted-API.js
@@ -22,6 +22,10 @@ function log_(msg) { if (true) dump(">>>>>>>>>>>>> " + msg + "\n"); }
 function run_test()
 {
   do_get_profile();
+  if (!newCacheBackEndUsed()) {
+    do_check_true(true, "This test checks only cache2 specific behavior.");
+    return;
+  }
   var lci = LoadContextInfo.default;
   var testingInterface = get_cache_service().QueryInterface(Ci.nsICacheTesting);
   do_check_true(testingInterface);
diff --git a/netwerk/test/unit/test_cache_jar.js b/netwerk/test/unit/test_cache_jar.js
index adba12bbbf10..e8fddfc48807 100644
--- a/netwerk/test/unit/test_cache_jar.js
+++ b/netwerk/test/unit/test_cache_jar.js
@@ -89,6 +89,10 @@ function run_all_tests() {
 var gTests;
 function run_test() {
   do_get_profile();
+  if (!newCacheBackEndUsed()) {
+    do_check_true(true, "This test checks only cache2 specific behavior.");
+    return;
+  }
   do_test_pending();
   httpserv = new HttpServer();
   httpserv.registerPathHandler("/cached", cached_handler);
diff --git a/netwerk/test/unit_ipc/test_cache_jar_wrap.js b/netwerk/test/unit_ipc/test_cache_jar_wrap.js
index 1f5b93f61975..fa2bb82a8db5 100644
--- a/netwerk/test/unit_ipc/test_cache_jar_wrap.js
+++ b/netwerk/test/unit_ipc/test_cache_jar_wrap.js
@@ -1,3 +1,4 @@
 function run_test() {
+  run_test_in_child("../unit/head_cache2.js");
   run_test_in_child("../unit/test_cache_jar.js");
-}
\ No newline at end of file
+}