diff --git a/src/contentScripts/communityConsole/utils/common.js b/src/contentScripts/communityConsole/utils/common.js
index 648fae2..68fb736 100644
--- a/src/contentScripts/communityConsole/utils/common.js
+++ b/src/contentScripts/communityConsole/utils/common.js
@@ -34,7 +34,8 @@
 // Adds a button to the thread list actions bar next to the button given by
 // |originalBtn|. The button will have icon |icon|, when hovered it will display
 // |tooltip|, and will have a debugid attribute with value |debugId|.
-export function addButtonToThreadListActions(originalBtn, icon, debugId, tooltip) {
+export function addButtonToThreadListActions(
+    originalBtn, icon, debugId, tooltip) {
   let clone = originalBtn.cloneNode(true);
   clone.setAttribute('debugid', debugId);
   clone.classList.add('TWPT-btn--with-badge');
@@ -59,3 +60,15 @@
 
   return clone;
 }
+
+// Returns true if |node| is the "mark as read/unread" button, the parent of the
+// parent of |node| is the actions bar of the thread list, and the button with
+// debugid |debugid| is NOT part of the actions bar.
+export function shouldAddBtnToActionBar(debugid, node) {
+  return node?.tagName == 'MATERIAL-BUTTON' &&
+      (node.getAttribute?.('debugid') == 'mark-read-button' ||
+       node.getAttribute?.('debugid') == 'mark-unread-button') &&
+      node.getAttribute?.('debugid') !== null &&
+      node.parentNode?.querySelector('[debugid="' + debugid + '"]') === null &&
+      node.parentNode?.parentNode?.tagName == 'EC-BULK-ACTIONS';
+}