--- a/dom/browser-element/BrowserElementPanning.js
+++ b/dom/browser-element/BrowserElementPanning.js
@@ -405,16 +405,17 @@ const ContentPanning = {
     }
 
     function targetParent(node) {
       return node.parentNode || node.frameElement || null;
     }
 
     function scroll(delta) {
       current = root;
+      firstScroll = true;
       while (current) {
         if (doScroll(current, delta)) {
           firstScroll = false;
           return true;
         }
 
         // TODO The current code looks for possible scrolling regions only if
         // this is the first scroll action but this should be more dynamic.