Disable test for bug 488417 because it seems to be making mochitest unhappy for later tests somehow.

layout/generic/test/Makefile.in

@@ -75,7 +75,6 @@ _TEST_FILES = \
 		test_bug468167.html \
 		test_bug469613.xul \
 		test_bug470212.html \
-		test_bug488417.html \
 		test_movement_by_characters.html \
 		test_movement_by_words.html \
 		test_plugin_clipping.xhtml \
@@ -83,6 +82,7 @@ _TEST_FILES = \
 		$(NULL)
 # disabled temporarily
 # 		test_plugin_position.xhtml \
+#		test_bug488417.html \
 
 libs:: $(_TEST_FILES)
 	$(INSTALL) $(foreach f,$^,"$f") $(DEPTH)/_tests/testing/mochitest/tests/$(relativesrcdir)