Skip dom/plugins tests on OSX 10.6 even harder (bug 1188052) a=me

dom/plugins/test/mochitest/chrome.ini

@@ -1,5 +1,5 @@
 [DEFAULT]
-skip-if = (buildapp == 'b2g' || buildapp == 'mulet')
+skip-if = (buildapp == 'b2g' || buildapp == 'mulet') || (os == "mac" && os_version == "10.6" && debug) #bug 1188052 for OSX 10.6
 support-files =
   hang_test.js
   privatemode_perwindowpb.xul