diff --git a/dom/bindings/Codegen.py b/dom/bindings/Codegen.py
index 8b070e89cf3..a81abe2e65b 100644
--- a/dom/bindings/Codegen.py
+++ b/dom/bindings/Codegen.py
@@ -1728,7 +1728,6 @@ class CGConstructNavigatorObject(CGAbstractMethod):
             JS::Rooted<JS::Value> v(aCx);
             {  // Scope to make sure |result| goes out of scope while |v| is rooted
               RefPtr<mozilla::dom::${descriptorName}> result = ConstructNavigatorObjectHelper(aCx, global, rv);
-              rv.WouldReportJSException();
               if (rv.MaybeSetPendingException(aCx)) {
                 return nullptr;
               }
@@ -6770,7 +6769,6 @@ class CGCallGenerator(CGThing):
             self.cgRoot.prepend(CGGeneric("ErrorResult rv;\n"))
             self.cgRoot.append(CGGeneric(dedent(
                 """
-                rv.WouldReportJSException();
                 if (MOZ_UNLIKELY(rv.MaybeSetPendingException(cx))) {
                   return false;
                 }
@@ -8243,7 +8241,6 @@ class CGEnumerateHook(CGAbstractBindingMethod):
             nsAutoTArray<nsString, 8> names;
             ErrorResult rv;
             self->GetOwnPropertyNames(cx, names, rv);
-            rv.WouldReportJSException();
             if (rv.MaybeSetPendingException(cx)) {
               return false;
             }
@@ -10301,7 +10298,6 @@ class CGEnumerateOwnPropertiesViaGetOwnPropertyNames(CGAbstractBindingMethod):
             nsAutoTArray<nsString, 8> names;
             ErrorResult rv;
             self->GetOwnPropertyNames(cx, names, rv);
-            rv.WouldReportJSException();
             if (rv.MaybeSetPendingException(cx)) {
               return false;
             }
diff --git a/dom/bindings/ErrorResult.h b/dom/bindings/ErrorResult.h
index d21f677cf1a..a44f3ba3bc1 100644
--- a/dom/bindings/ErrorResult.h
+++ b/dom/bindings/ErrorResult.h
@@ -160,6 +160,7 @@ public:
   // after true is returned.
   bool MaybeSetPendingException(JSContext* cx)
   {
+    WouldReportJSException();
     if (!Failed()) {
       return false;
     }
@@ -187,9 +188,8 @@ public:
   // Facilities for throwing a preexisting JS exception value via this
   // ErrorResult.  The contract is that any code which might end up calling
   // ThrowJSException() must call MightThrowJSException() even if no exception
-  // is being thrown.  Code that would call MaybeSetPendingException or
-  // StealJSException as needed must first call WouldReportJSException even if
-  // this ErrorResult has not failed.
+  // is being thrown.  Code that would call StealJSException as needed must
+  // first call WouldReportJSException even if this ErrorResult has not failed.
   //
   // The exn argument to ThrowJSException can be in any compartment.  It does
   // not have to be in the compartment of cx.  If someone later uses it, they
diff --git a/dom/fetch/Fetch.cpp b/dom/fetch/Fetch.cpp
index 8cd2ec76335..773dff4de13 100644
--- a/dom/fetch/Fetch.cpp
+++ b/dom/fetch/Fetch.cpp
@@ -1007,7 +1007,6 @@ FetchBody<Derived>::ContinueConsumeBody(nsresult aStatus, uint32_t aResultLength
       FetchUtil::ConsumeArrayBuffer(cx, &arrayBuffer, aResultLength, aResult,
                                     error);
 
-      error.WouldReportJSException();
       if (!error.Failed()) {
         JS::Rooted<JS::Value> val(cx);
         val.setObjectOrNull(arrayBuffer);
@@ -1022,7 +1021,6 @@ FetchBody<Derived>::ContinueConsumeBody(nsresult aStatus, uint32_t aResultLength
       RefPtr<dom::Blob> blob = FetchUtil::ConsumeBlob(
         DerivedClass()->GetParentObject(), NS_ConvertUTF8toUTF16(mMimeType),
         aResultLength, aResult, error);
-      error.WouldReportJSException();
       if (!error.Failed()) {
         localPromise->MaybeResolve(blob);
         // File takes over ownership.
diff --git a/js/xpconnect/src/Sandbox.cpp b/js/xpconnect/src/Sandbox.cpp
index 1e800beb197..f8fa3c4eeb3 100644
--- a/js/xpconnect/src/Sandbox.cpp
+++ b/js/xpconnect/src/Sandbox.cpp
@@ -289,7 +289,6 @@ SandboxFetch(JSContext* cx, JS::HandleObject scope, const CallArgs& args)
     ErrorResult rv;
     RefPtr<dom::Promise> response =
         FetchRequest(global, Constify(request), Constify(options), rv);
-    rv.WouldReportJSException();
     if (rv.MaybeSetPendingException(cx)) {
         return false;
     }