diff --git a/browser_patches/firefox-beta/BUILD_NUMBER b/browser_patches/firefox-beta/BUILD_NUMBER
index 1e802310ff..e7ae78ed45 100644
--- a/browser_patches/firefox-beta/BUILD_NUMBER
+++ b/browser_patches/firefox-beta/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1337
-Changed: yurys@chromium.org Thu Jul 28 13:35:27 PDT 2022
+1338
+Changed: yurys@chromium.org Fri Jul 29 16:52:50 PDT 2022
diff --git a/browser_patches/firefox-beta/juggler/protocol/PageHandler.js b/browser_patches/firefox-beta/juggler/protocol/PageHandler.js
index 41878434bf..415f395aaf 100644
--- a/browser_patches/firefox-beta/juggler/protocol/PageHandler.js
+++ b/browser_patches/firefox-beta/juggler/protocol/PageHandler.js
@@ -123,7 +123,7 @@ class PageHandler {
         pageWorkerDestroyed: this._onWorkerDestroyed.bind(this),
         runtimeConsole: params => {
           const consoleMessageHash = hashConsoleMessage(params);
-          for (const worker of this._workers) {
+          for (const worker of this._workers.values()) {
             if (worker._workerConsoleMessages.has(consoleMessageHash)) {
               worker._workerConsoleMessages.delete(consoleMessageHash);
               return;
diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index 7b649673c3..af46b4b477 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1338
-Changed: lushnikov@chromium.org Fri 29 Jul 2022 05:20:32 AM PDT
+1339
+Changed: yurys@chromium.org Fri Jul 29 16:50:33 PDT 2022
diff --git a/browser_patches/firefox/juggler/protocol/PageHandler.js b/browser_patches/firefox/juggler/protocol/PageHandler.js
index 41878434bf..415f395aaf 100644
--- a/browser_patches/firefox/juggler/protocol/PageHandler.js
+++ b/browser_patches/firefox/juggler/protocol/PageHandler.js
@@ -123,7 +123,7 @@ class PageHandler {
         pageWorkerDestroyed: this._onWorkerDestroyed.bind(this),
         runtimeConsole: params => {
           const consoleMessageHash = hashConsoleMessage(params);
-          for (const worker of this._workers) {
+          for (const worker of this._workers.values()) {
             if (worker._workerConsoleMessages.has(consoleMessageHash)) {
               worker._workerConsoleMessages.delete(consoleMessageHash);
               return;