diff --git a/browser/metro/base/tests/mochitest/Makefile.in b/browser/metro/base/tests/mochitest/Makefile.in
index 998bcc29239..e1235e54a2f 100644
--- a/browser/metro/base/tests/mochitest/Makefile.in
+++ b/browser/metro/base/tests/mochitest/Makefile.in
@@ -10,20 +10,17 @@ relativesrcdir  = @relativesrcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-# Disabled for intermittent failures
-# Bug 880739
-#  browser_context_menu_tests.js \
-#  browser_context_menu_tests_01.html \
-#  browser_context_menu_tests_02.html \
-#  browser_context_menu_tests_03.html \
-#  browser_context_menu_tests_04.html \
-
 MOCHITEST_METRO_FILES = \
   head.js \
   browser_urlbar.js \
   browser_bookmarks.js \
   browser_canonizeURL.js \
   browser_circular_progress_indicator.js \
+  browser_context_menu_tests.js \
+  browser_context_menu_tests_01.html \
+  browser_context_menu_tests_02.html \
+  browser_context_menu_tests_03.html \
+  browser_context_menu_tests_04.html \
   browser_context_ui.js \
   browser_downloads.js \
   browser_findbar.js \
diff --git a/browser/metro/base/tests/mochitest/browser_context_menu_tests.js b/browser/metro/base/tests/mochitest/browser_context_menu_tests.js
index 2eda2a7decf..0b551b77ddb 100644
--- a/browser/metro/base/tests/mochitest/browser_context_menu_tests.js
+++ b/browser/metro/base/tests/mochitest/browser_context_menu_tests.js
@@ -352,6 +352,9 @@ gTests.push({
   }
 });
 
+/*
+XXX code used to diagnose bug 880739
+
 var observeLogger = {
   observe: function (aSubject, aTopic, aData) {
     info("observeLogger: " + aTopic);
@@ -383,15 +386,18 @@ var observeLogger = {
     Services.obs.removeObserver(observeLogger, "dl-cancel");
   }
 }
+*/
 
 // Image context menu tests
 gTests.push({
   desc: "image context menu",
   setUp: function() {
-    observeLogger.init();
+    // XXX code used to diagnose bug 880739
+    //observeLogger.init();
   },
   tearDown: function() {
-    observeLogger.shutdown();
+    // XXX code used to diagnose bug 880739
+    //observeLogger.shutdown();
   },
   run: function test() {
     info(chromeRoot + "browser_context_menu_tests_01.html");