--- a/layout/inspector/inDOMUtils.cpp
+++ b/layout/inspector/inDOMUtils.cpp
@@ -279,17 +279,18 @@ inDOMUtils::GetCSSStyleRules(nsIDOMEleme
       ServoStyleRuleMap* map = styleSet->StyleRuleMap();
       map->EnsureTable();
       maps.AppendElement(map);
     }
 
     // Collect style rule maps for bindings.
     for (nsIContent* bindingContent = element; bindingContent;
          bindingContent = bindingContent->GetBindingParent()) {
-      if (nsXBLBinding* binding = bindingContent->GetXBLBinding()) {
+      for (nsXBLBinding* binding = bindingContent->GetXBLBinding();
+           binding; binding = binding->GetBaseBinding()) {
         if (ServoStyleSet* styleSet = binding->GetServoStyleSet()) {
           ServoStyleRuleMap* map = styleSet->StyleRuleMap();
           map->EnsureTable();
           maps.AppendElement(map);
         }
       }
       // Note that we intentionally don't cut off here, unlike when we
       // do styling, because even if style rules from parent binding