Bug 874423 - Skip test_bug430723.html on OSX/Win opt. r=me,a=test-only

docshell/test/navigation/mochitest.ini

@@ -50,7 +50,7 @@ skip-if = toolkit == "android" || toolkit == "windows" # disabled on Windows bec
 [test_bug386782.html]
 [test_bug430624.html]
 [test_bug430723.html]
-skip-if = toolkit == 'android' #TIMED_OUT
+skip-if = (toolkit == 'android') || (!debug && (os == 'mac' || os == 'win')) # Bug 874423
 [test_child.html]
 [test_grandchild.html]
 [test_not-opener.html]