diff --git a/browser_patches/firefox-beta/BUILD_NUMBER b/browser_patches/firefox-beta/BUILD_NUMBER
index aebcbfe0e6..59dad47440 100644
--- a/browser_patches/firefox-beta/BUILD_NUMBER
+++ b/browser_patches/firefox-beta/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1299
-Changed: lushnikov@chromium.org Wed 27 Oct 2021 12:40:16 AM PDT
+1300
+Changed: yurys@chromium.org Wed Oct 27 17:58:07 PDT 2021
diff --git a/browser_patches/firefox-beta/juggler/TargetRegistry.js b/browser_patches/firefox-beta/juggler/TargetRegistry.js
index d8f5dbbc89..a0b470c71d 100644
--- a/browser_patches/firefox-beta/juggler/TargetRegistry.js
+++ b/browser_patches/firefox-beta/juggler/TargetRegistry.js
@@ -159,8 +159,9 @@ class TargetRegistry {
       const openerContext = tab.linkedBrowser.browsingContext.opener;
       let openerTarget;
       if (openerContext) {
-        // Popups usually have opener context.
-        openerTarget = this._browserBrowsingContextToTarget.get(openerContext);
+        // Popups usually have opener context. Get top context for the case when opener is
+        // an iframe.
+        openerTarget = this._browserBrowsingContextToTarget.get(openerContext.top);
       } else if (tab.openerTab) {
         // Noopener popups from the same window have opener tab instead.
         openerTarget = this._browserToTarget.get(tab.openerTab.linkedBrowser);
diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index cee08010e5..6b399055af 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1297
-Changed: lushnikov@chromium.org Fri Oct 15 18:51:16 PDT 2021
+1298
+Changed: yurys@chromium.org Wed Oct 27 17:58:07 PDT 2021
diff --git a/browser_patches/firefox/juggler/TargetRegistry.js b/browser_patches/firefox/juggler/TargetRegistry.js
index d8f5dbbc89..a0b470c71d 100644
--- a/browser_patches/firefox/juggler/TargetRegistry.js
+++ b/browser_patches/firefox/juggler/TargetRegistry.js
@@ -159,8 +159,9 @@ class TargetRegistry {
       const openerContext = tab.linkedBrowser.browsingContext.opener;
       let openerTarget;
       if (openerContext) {
-        // Popups usually have opener context.
-        openerTarget = this._browserBrowsingContextToTarget.get(openerContext);
+        // Popups usually have opener context. Get top context for the case when opener is
+        // an iframe.
+        openerTarget = this._browserBrowsingContextToTarget.get(openerContext.top);
       } else if (tab.openerTab) {
         // Noopener popups from the same window have opener tab instead.
         openerTarget = this._browserToTarget.get(tab.openerTab.linkedBrowser);