diff --git a/Userland/Libraries/LibWeb/Fetch/Body.cpp b/Userland/Libraries/LibWeb/Fetch/Body.cpp
index 5c8c259e5d0..36118545ef3 100644
--- a/Userland/Libraries/LibWeb/Fetch/Body.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Body.cpp
@@ -112,7 +112,7 @@ WebIDL::ExceptionOr<JS::Value> package_data(JS::Realm& realm, ByteBuffer bytes,
     case PackageDataType::Blob: {
         // Return a Blob whose contents are bytes and type attribute is mimeType.
         // NOTE: If extracting the mime type returns failure, other browsers set it to an empty string - not sure if that's spec'd.
-        auto mime_type_string = mime_type.has_value() ? TRY_OR_THROW_OOM(vm, mime_type->serialized()) : String {};
+        auto mime_type_string = mime_type.has_value() ? MUST(mime_type->serialized()) : String {};
         return FileAPI::Blob::create(realm, move(bytes), move(mime_type_string));
     }
     case PackageDataType::FormData:
@@ -142,7 +142,7 @@ WebIDL::ExceptionOr<JS::Value> package_data(JS::Realm& realm, ByteBuffer bytes,
         auto decoder = TextCodec::decoder_for("UTF-8"sv);
         VERIFY(decoder.has_value());
 
-        auto utf8_text = TRY_OR_THROW_OOM(vm, TextCodec::convert_input_to_utf8_using_given_decoder_unless_there_is_a_byte_order_mark(*decoder, bytes));
+        auto utf8_text = MUST(TextCodec::convert_input_to_utf8_using_given_decoder_unless_there_is_a_byte_order_mark(*decoder, bytes));
         return JS::PrimitiveString::create(vm, move(utf8_text));
     }
     default:
@@ -181,7 +181,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> consume_body(JS::Realm& realm
         HTML::TemporaryExecutionContext execution_context { Bindings::host_defined_environment_settings_object(realm) };
 
         auto value_or_error = Bindings::throw_dom_exception_if_needed(vm, [&]() -> WebIDL::ExceptionOr<JS::Value> {
-            return package_data(realm, data, type, TRY_OR_THROW_OOM(vm, object.mime_type_impl()));
+            return package_data(realm, data, type, object.mime_type_impl());
         });
 
         if (value_or_error.is_error()) {
diff --git a/Userland/Libraries/LibWeb/Fetch/Body.h b/Userland/Libraries/LibWeb/Fetch/Body.h
index 4ad3445cc3f..dc072f44176 100644
--- a/Userland/Libraries/LibWeb/Fetch/Body.h
+++ b/Userland/Libraries/LibWeb/Fetch/Body.h
@@ -26,7 +26,7 @@ class BodyMixin {
 public:
     virtual ~BodyMixin();
 
-    virtual ErrorOr<Optional<MimeSniff::MimeType>> mime_type_impl() const = 0;
+    virtual Optional<MimeSniff::MimeType> mime_type_impl() const = 0;
     virtual JS::GCPtr<Infrastructure::Body> body_impl() = 0;
     virtual JS::GCPtr<Infrastructure::Body const> body_impl() const = 0;
     virtual Bindings::PlatformObject& as_platform_object() = 0;
diff --git a/Userland/Libraries/LibWeb/Fetch/Request.cpp b/Userland/Libraries/LibWeb/Fetch/Request.cpp
index 199877e359e..7cc571cd2ec 100644
--- a/Userland/Libraries/LibWeb/Fetch/Request.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Request.cpp
@@ -47,7 +47,7 @@ void Request::visit_edges(Cell::Visitor& visitor)
 
 // https://fetch.spec.whatwg.org/#concept-body-mime-type
 // https://fetch.spec.whatwg.org/#ref-for-concept-body-mime-type%E2%91%A0
-ErrorOr<Optional<MimeSniff::MimeType>> Request::mime_type_impl() const
+Optional<MimeSniff::MimeType> Request::mime_type_impl() const
 {
     // Objects including the Body interface mixin need to define an associated MIME type algorithm which takes no arguments and returns failure or a MIME type.
     // A Request object’s MIME type is to return the result of extracting a MIME type from its request’s header list.
diff --git a/Userland/Libraries/LibWeb/Fetch/Request.h b/Userland/Libraries/LibWeb/Fetch/Request.h
index 45281777c38..07cdeede151 100644
--- a/Userland/Libraries/LibWeb/Fetch/Request.h
+++ b/Userland/Libraries/LibWeb/Fetch/Request.h
@@ -73,7 +73,7 @@ public:
     virtual ~Request() override;
 
     // ^BodyMixin
-    virtual ErrorOr<Optional<MimeSniff::MimeType>> mime_type_impl() const override;
+    virtual Optional<MimeSniff::MimeType> mime_type_impl() const override;
     virtual JS::GCPtr<Infrastructure::Body> body_impl() override;
     virtual JS::GCPtr<Infrastructure::Body const> body_impl() const override;
     virtual Bindings::PlatformObject& as_platform_object() override { return *this; }
diff --git a/Userland/Libraries/LibWeb/Fetch/Response.cpp b/Userland/Libraries/LibWeb/Fetch/Response.cpp
index 29d0b63cd8c..db2e3890d01 100644
--- a/Userland/Libraries/LibWeb/Fetch/Response.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Response.cpp
@@ -44,7 +44,7 @@ void Response::visit_edges(Cell::Visitor& visitor)
 
 // https://fetch.spec.whatwg.org/#concept-body-mime-type
 // https://fetch.spec.whatwg.org/#ref-for-concept-header-extract-mime-type%E2%91%A7
-ErrorOr<Optional<MimeSniff::MimeType>> Response::mime_type_impl() const
+Optional<MimeSniff::MimeType> Response::mime_type_impl() const
 {
     // Objects including the Body interface mixin need to define an associated MIME type algorithm which takes no arguments and returns failure or a MIME type.
     // A Response object’s MIME type is to return the result of extracting a MIME type from its response’s header list.
diff --git a/Userland/Libraries/LibWeb/Fetch/Response.h b/Userland/Libraries/LibWeb/Fetch/Response.h
index bce68a53cf4..f0c986a2256 100644
--- a/Userland/Libraries/LibWeb/Fetch/Response.h
+++ b/Userland/Libraries/LibWeb/Fetch/Response.h
@@ -40,7 +40,7 @@ public:
     virtual ~Response() override;
 
     // ^BodyMixin
-    virtual ErrorOr<Optional<MimeSniff::MimeType>> mime_type_impl() const override;
+    virtual Optional<MimeSniff::MimeType> mime_type_impl() const override;
     virtual JS::GCPtr<Infrastructure::Body> body_impl() override;
     virtual JS::GCPtr<Infrastructure::Body const> body_impl() const override;
     virtual Bindings::PlatformObject& as_platform_object() override { return *this; }