diff --git a/src/contentScripts/communityConsole/main.js b/src/contentScripts/communityConsole/main.js
index 890f3b0..f5d5a47 100644
--- a/src/contentScripts/communityConsole/main.js
+++ b/src/contentScripts/communityConsole/main.js
@@ -43,6 +43,9 @@
   // Thread list (used for the autorefresh feature)
   'ec-thread-list',
 
+  // Thread page main content
+  'ec-thread > .page > .material-content > div[role="list"]',
+
   // Thread page reply section (for the thread page toolbar)
   kRepliesSectionSelector,
 
@@ -90,6 +93,12 @@
       avatars.injectIfEnabled(node);
     }
 
+    // Inject old thread page design warning if applicable
+    if (node.matches(
+            'ec-thread > .page > .material-content > div[role="list"]')) {
+      window.TWPTThreadPageDesignWarning.injectWarningIfApplicable(node);
+    }
+
     // Inject thread toolbar
     if (threadToolbar.shouldInject(node)) {
       threadToolbar.injectIfApplicable(node);