Remove unnecessary comment from bug 435743

toolkit/mozapps/extensions/test/Makefile.in

@@ -66,7 +66,6 @@ _CHROME_FILES = \
 
 include $(topsrcdir)/config/rules.mk
 
-# disabled due to potentially breaking other tests
 libs:: $(_CHROME_FILES)
 	$(INSTALL) $(foreach f,$^,"$f") $(DEPTH)/_tests/testing/mochitest/chrome/$(relativesrcdir)