diff --git a/public/popup.html b/public/popup.html
index 0ebd5e2b..59d58565 100644
--- a/public/popup.html
+++ b/public/popup.html
@@ -11,7 +11,7 @@
   <body id="sponsorBlockPopupBody" style="visibility: hidden">
     <div id="sponsorblockPopup" class="sponsorBlockPageBody sb-preload">
 
-      <button id="sbCloseButton" title="__MSG_closePopup__" class="sbCloseButton">
+      <button id="sbCloseButton" title="__MSG_closePopup__" class="sbCloseButton hidden">
         <img src="icons/close.png" width="15" height="15">
       </button>
 
diff --git a/src/popup.ts b/src/popup.ts
index 568b2436..92b5fe01 100644
--- a/src/popup.ts
+++ b/src/popup.ts
@@ -140,6 +140,10 @@ async function runThePopup(messageListener?: MessageListener): Promise<void> {
         });
     });
 
+    if (window !== window.top) {
+        PageElements.sbCloseButton.classList.remove("hidden");
+    }
+
     // Hide donate button if wanted (Safari, or user choice)
     if (!showDonationLink()) {
         PageElements.sbDonate.style.display = "none";
