Try suppressing node_validator test for ff/windows, see if it stops the crashing

tests/html/html.status

Index: tests/html/html.status
diff --git a/tests/html/html.status b/tests/html/html.status
index 4e0e5ba25c2f4cbd3ddcea8b65d79658f6a87ba6..3e430da0c12ef8c43d81b21fa343bb1617d6521a 100644
--- a/tests/html/html.status
+++ b/tests/html/html.status
@@ -358,6 +358,9 @@ webgl_1_test: Pass, Fail   # Issue 8219
 canvasrenderingcontext2d_test/drawImage_video_element_dataUrl: Pass, Fail # Firefox pre-38 does not like dataUrl videos for drawImage Issue 23479
 text_event_test: Fail # Issue 17893
 
+[ $compiler == dart2js && $runtime == ff && $system == windows]
+node_validator_important_if_you_suppress_make_the_bug_critical_test: Skip # 24434
+
 # Firefox Feature support statuses-
 # All changes should be accompanied by platform support annotation changes.
 document_test/supports_cssCanvasContext: Fail