diff --git a/browser_patches/firefox-beta/BUILD_NUMBER b/browser_patches/firefox-beta/BUILD_NUMBER
index 578e5c10bf..77613a51b7 100644
--- a/browser_patches/firefox-beta/BUILD_NUMBER
+++ b/browser_patches/firefox-beta/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1305
-Changed: aslushnikov@gmail.com Thu Nov 11 15:24:13 HST 2021
+1306
+Changed: max@schmitt.mx Mon 29 Nov 2021 13:10:11 CET
diff --git a/browser_patches/firefox-beta/juggler/content/Runtime.js b/browser_patches/firefox-beta/juggler/content/Runtime.js
index ab5ddb6918..925a435cbe 100644
--- a/browser_patches/firefox-beta/juggler/content/Runtime.js
+++ b/browser_patches/firefox-beta/juggler/content/Runtime.js
@@ -129,7 +129,7 @@ class Runtime {
 
       observe: message => {
         if (!(message instanceof Ci.nsIScriptError) || !message.outerWindowID ||
-            !message.category || disallowedMessageCategories.has(message.category)) {
+            !message.category || disallowedMessageCategories.has(message.category) || message.hasException) {
           return;
         }
         const errorWindow = Services.wm.getOuterWindowWithId(message.outerWindowID);
diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index ed71edfe68..2acfbf4b33 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1306
-Changed: lushnikov@chromium.org Thu Nov 11 15:24:13 HST 2021
+1307
+Changed: max@schmitt.mx Mon 29 Nov 2021 13:10:11 CET
diff --git a/browser_patches/firefox/juggler/content/Runtime.js b/browser_patches/firefox/juggler/content/Runtime.js
index ab5ddb6918..925a435cbe 100644
--- a/browser_patches/firefox/juggler/content/Runtime.js
+++ b/browser_patches/firefox/juggler/content/Runtime.js
@@ -129,7 +129,7 @@ class Runtime {
 
       observe: message => {
         if (!(message instanceof Ci.nsIScriptError) || !message.outerWindowID ||
-            !message.category || disallowedMessageCategories.has(message.category)) {
+            !message.category || disallowedMessageCategories.has(message.category) || message.hasException) {
           return;
         }
         const errorWindow = Services.wm.getOuterWindowWithId(message.outerWindowID);