diff --git a/browser/components/extensions/ExtensionPopups.jsm b/browser/components/extensions/ExtensionPopups.jsm
index 3971c121abe7..0d008fc0189b 100644
--- a/browser/components/extensions/ExtensionPopups.jsm
+++ b/browser/components/extensions/ExtensionPopups.jsm
@@ -239,7 +239,6 @@ class BasePopup {
 
     let stack = document.createXULElement("stack");
     stack.setAttribute("class", "webextension-popup-stack");
-    stack.setAttribute("renderroot", "content");
 
     let browser = document.createXULElement("browser");
     browser.setAttribute("type", "content");
@@ -257,6 +256,7 @@ class BasePopup {
     if (this.extension.remote) {
       browser.setAttribute("remote", "true");
       browser.setAttribute("remoteType", E10SUtils.EXTENSION_REMOTE_TYPE);
+      browser.setAttribute("renderroot", "content");
     }
 
     // We only need flex sizing for the sake of the slide-in sub-views of the