Bug 766886 - Disable test_pluginstream_seek_close.html for intermittent leaks

dom/plugins/test/mochitest/Makefile.in

@@ -40,7 +40,7 @@ MOCHITEST_FILES = \
   test_pluginstream_poststream.html \
   test_pluginstream_seek.html \
   test_pluginstream_newstream.html \
-  test_pluginstream_seek_close.html \
+  $(warning test_pluginstream_seek_close.html disabled for intermittent leaks. Bug 766886) \
   test_fullpage.html \
   loremipsum.xtest \
   loremipsum.xtest^headers^ \