diff --git a/testing/web-platform/meta/css/css-transitions/properties-value-002.html.ini b/testing/web-platform/meta/css/css-transitions/properties-value-002.html.ini
index 514c500c049b..38279bf31d24 100644
--- a/testing/web-platform/meta/css/css-transitions/properties-value-002.html.ini
+++ b/testing/web-platform/meta/css/css-transitions/properties-value-002.html.ini
@@ -1,4 +1,6 @@
 [properties-value-002.html]
+  disabled:
+    if debug or asan: https://bugzilla.mozilla.org/show_bug.cgi?id=1358510
   [vertical-align vertical(keyword) / values]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/css/css-transitions/properties-value-003.html.ini b/testing/web-platform/meta/css/css-transitions/properties-value-003.html.ini
index d3fcb7c0fd5e..51a83540a995 100644
--- a/testing/web-platform/meta/css/css-transitions/properties-value-003.html.ini
+++ b/testing/web-platform/meta/css/css-transitions/properties-value-003.html.ini
@@ -1,4 +1,6 @@
 [properties-value-003.html]
+  disabled:
+    if debug or asan: https://bugzilla.mozilla.org/show_bug.cgi?id=1358510
   [background-image image(url) / values]
     expected: FAIL