diff --git a/Ladybird/Qt/RequestManagerQt.cpp b/Ladybird/Qt/RequestManagerQt.cpp
index c3dfb838cbc..d1156d618ca 100644
--- a/Ladybird/Qt/RequestManagerQt.cpp
+++ b/Ladybird/Qt/RequestManagerQt.cpp
@@ -5,15 +5,24 @@
  */
 
 #include "RequestManagerQt.h"
+#include "StringUtils.h"
 #include "WebSocketImplQt.h"
 #include "WebSocketQt.h"
 #include <QNetworkCookie>
 
 namespace Ladybird {
 
-RequestManagerQt::RequestManagerQt()
+RequestManagerQt::RequestManagerQt(Vector<ByteString> const& certificate_paths)
 {
     m_qnam = new QNetworkAccessManager(this);
+    auto ssl_configuration = QSslConfiguration::defaultConfiguration();
+    ssl_configuration.setPeerVerifyMode(QSslSocket::VerifyNone);
+    for (auto const& certificate_path : certificate_paths) {
+        auto certificates = QSslCertificate::fromPath(qstring_from_ak_string(certificate_path));
+        for (auto const& certificate : certificates)
+            ssl_configuration.addCaCertificate(certificate);
+    }
+    QSslConfiguration::setDefaultConfiguration(ssl_configuration);
 
     QObject::connect(m_qnam, &QNetworkAccessManager::finished, this, &RequestManagerQt::reply_finished);
 }
diff --git a/Ladybird/Qt/RequestManagerQt.h b/Ladybird/Qt/RequestManagerQt.h
index 578747d3ea4..c4698a0f308 100644
--- a/Ladybird/Qt/RequestManagerQt.h
+++ b/Ladybird/Qt/RequestManagerQt.h
@@ -17,9 +17,9 @@ class RequestManagerQt
     , public Web::ResourceLoaderConnector {
     Q_OBJECT
 public:
-    static NonnullRefPtr<RequestManagerQt> create()
+    static NonnullRefPtr<RequestManagerQt> create(Vector<ByteString> const& certificate_paths)
     {
-        return adopt_ref(*new RequestManagerQt());
+        return adopt_ref(*new RequestManagerQt(certificate_paths));
     }
 
     virtual ~RequestManagerQt() override { }
@@ -34,7 +34,7 @@ private slots:
     void reply_finished(QNetworkReply*);
 
 private:
-    RequestManagerQt();
+    explicit RequestManagerQt(Vector<ByteString> const& certificate_paths);
 
     class Request
         : public Web::ResourceLoaderConnectorRequest {
diff --git a/Ladybird/WebContent/main.cpp b/Ladybird/WebContent/main.cpp
index f8f9e75484c..cca477a5621 100644
--- a/Ladybird/WebContent/main.cpp
+++ b/Ladybird/WebContent/main.cpp
@@ -113,6 +113,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.add_option(is_layout_test_mode, "Is layout test mode", "layout-test-mode");
     args_parser.add_option(expose_internals_object, "Expose internals object", "expose-internals-object");
     args_parser.add_option(use_lagom_networking, "Enable Lagom servers for networking", "use-lagom-networking");
+    args_parser.add_option(certificates, "Path to a certificate file", "certificate", 'C', "certificate");
     args_parser.add_option(use_skia_painter, "Enable Skia painter", "use-skia-painting");
     args_parser.add_option(wait_for_debugger, "Wait for debugger", "wait-for-debugger");
     args_parser.add_option(mach_server_name, "Mach server name", "mach-server-name", 0, "mach_server_name");
@@ -150,7 +151,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
 #if defined(HAVE_QT)
     if (!use_lagom_networking)
-        Web::ResourceLoader::initialize(Ladybird::RequestManagerQt::create());
+        Web::ResourceLoader::initialize(Ladybird::RequestManagerQt::create(certificates));
     else
 #endif
         TRY(initialize_lagom_networking(request_server_socket));
diff --git a/Ladybird/WebWorker/main.cpp b/Ladybird/WebWorker/main.cpp
index 4041a00965f..b1bf2924c22 100644
--- a/Ladybird/WebWorker/main.cpp
+++ b/Ladybird/WebWorker/main.cpp
@@ -39,12 +39,14 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     int request_server_socket { -1 };
     StringView serenity_resource_root;
+    Vector<ByteString> certificates;
     bool use_lagom_networking { false };
 
     Core::ArgsParser args_parser;
     args_parser.add_option(request_server_socket, "File descriptor of the request server socket", "request-server-socket", 's', "request-server-socket");
     args_parser.add_option(serenity_resource_root, "Absolute path to directory for serenity resources", "serenity-resource-root", 'r', "serenity-resource-root");
     args_parser.add_option(use_lagom_networking, "Enable Lagom servers for networking", "use-lagom-networking");
+    args_parser.add_option(certificates, "Path to a certificate file", "certificate", 'C', "certificate");
     args_parser.parse(arguments);
 
 #if defined(HAVE_QT)
@@ -61,7 +63,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
 #if defined(HAVE_QT)
     if (!use_lagom_networking)
-        Web::ResourceLoader::initialize(Ladybird::RequestManagerQt::create());
+        Web::ResourceLoader::initialize(Ladybird::RequestManagerQt::create(certificates));
     else
 #endif
         TRY(initialize_lagom_networking(request_server_socket));