Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 2002 insertions, 0 deletions

diff --git a/toolkit/system/gnome/components.conf b/toolkit/system/gnome/components.conf
new file mode 100644
index 0000000000..1aa0ab1048
--- /dev/null
+++ b/toolkit/system/gnome/components.conf
@@ -0,0 +1,28 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+Classes = [
+    {
+        'cid': '{e3a1f3c9-3ae1-4b40-a5e0-7b457fc9a9ad}',
+        'contract_ids': ['@mozilla.org/gio-service;1'],
+        'type': 'nsGIOService',
+        'headers': ['/toolkit/system/gnome/nsGIOService.h'],
+    },
+    {
+        'cid': '{bfd4a9d8-d886-4161-81ef-8868da114170}',
+        'contract_ids': ['@mozilla.org/gsettings-service;1'],
+        'type': 'nsGSettingsService',
+        'headers': ['/toolkit/system/gnome/nsGSettingsService.h'],
+        'init_method': 'Init',
+    },
+    {
+        'cid': '{84e11f80-ca55-11dd-ad8b-0800200c9a66}',
+        'contract_ids': ['@mozilla.org/system-alerts-service;1'],
+        'type': 'nsSystemAlertsService',
+        'headers': ['/toolkit/system/gnome/nsSystemAlertsService.h'],
+        'init_method': 'Init',
+    },
+]
diff --git a/toolkit/system/gnome/moz.build b/toolkit/system/gnome/moz.build
new file mode 100644
index 0000000000..a1b4aa29f2
--- /dev/null
+++ b/toolkit/system/gnome/moz.build
@@ -0,0 +1,32 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+with Files("**"):
+    BUG_COMPONENT = ("Firefox", "Shell Integration")
+
+SOURCES += [
+    "nsAlertsIconListener.cpp",
+    "nsSystemAlertsService.cpp",
+]
+
+SOURCES += [
+    "nsGIOService.cpp",
+    "nsGSettingsService.cpp",
+]
+
+XPCOM_MANIFESTS += [
+    "components.conf",
+]
+
+FINAL_LIBRARY = "xul"
+
+LOCAL_INCLUDES += [
+    "/toolkit/components/build/",
+]
+
+CXXFLAGS += CONFIG["GLIB_CFLAGS"]
+CXXFLAGS += CONFIG["MOZ_DBUS_GLIB_CFLAGS"]
+CXXFLAGS += CONFIG["MOZ_GTK3_CFLAGS"]
diff --git a/toolkit/system/gnome/nsAlertsIconListener.cpp b/toolkit/system/gnome/nsAlertsIconListener.cpp
new file mode 100644
index 0000000000..7f6f1a70e1
--- /dev/null
+++ b/toolkit/system/gnome/nsAlertsIconListener.cpp
@@ -0,0 +1,351 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode:nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsAlertsIconListener.h"
+#include "imgIContainer.h"
+#include "imgIRequest.h"
+#include "nsServiceManagerUtils.h"
+#include "nsSystemAlertsService.h"
+#include "nsIAlertsService.h"
+#include "nsICancelable.h"
+#include "nsImageToPixbuf.h"
+#include "nsIStringBundle.h"
+#include "nsIObserverService.h"
+#include "nsCRT.h"
+#include "mozilla/XREAppData.h"
+#include "mozilla/GRefPtr.h"
+#include "mozilla/GUniquePtr.h"
+#include "mozilla/UniquePtrExtensions.h"
+
+#include <dlfcn.h>
+#include <gdk/gdk.h>
+
+using namespace mozilla;
+extern const StaticXREAppData* gAppData;
+
+static bool gHasActions = false;
+static bool gHasCaps = false;
+
+void* nsAlertsIconListener::libNotifyHandle = nullptr;
+bool nsAlertsIconListener::libNotifyNotAvail = false;
+nsAlertsIconListener::notify_is_initted_t
+    nsAlertsIconListener::notify_is_initted = nullptr;
+nsAlertsIconListener::notify_init_t nsAlertsIconListener::notify_init = nullptr;
+nsAlertsIconListener::notify_get_server_caps_t
+    nsAlertsIconListener::notify_get_server_caps = nullptr;
+nsAlertsIconListener::notify_notification_new_t
+    nsAlertsIconListener::notify_notification_new = nullptr;
+nsAlertsIconListener::notify_notification_show_t
+    nsAlertsIconListener::notify_notification_show = nullptr;
+nsAlertsIconListener::notify_notification_set_icon_from_pixbuf_t
+    nsAlertsIconListener::notify_notification_set_icon_from_pixbuf = nullptr;
+nsAlertsIconListener::notify_notification_add_action_t
+    nsAlertsIconListener::notify_notification_add_action = nullptr;
+nsAlertsIconListener::notify_notification_close_t
+    nsAlertsIconListener::notify_notification_close = nullptr;
+nsAlertsIconListener::notify_notification_set_hint_t
+    nsAlertsIconListener::notify_notification_set_hint = nullptr;
+
+static void notify_action_cb(NotifyNotification* notification, gchar* action,
+                             gpointer user_data) {
+  nsAlertsIconListener* alert = static_cast<nsAlertsIconListener*>(user_data);
+  alert->SendCallback();
+}
+
+static void notify_closed_marshal(GClosure* closure, GValue* return_value,
+                                  guint n_param_values,
+                                  const GValue* param_values,
+                                  gpointer invocation_hint,
+                                  gpointer marshal_data) {
+  MOZ_ASSERT(n_param_values >= 1, "No object in params");
+
+  nsAlertsIconListener* alert =
+      static_cast<nsAlertsIconListener*>(closure->data);
+  alert->SendClosed();
+  NS_RELEASE(alert);
+}
+
+static already_AddRefed<GdkPixbuf> GetPixbufFromImgRequest(
+    imgIRequest* aRequest) {
+  nsCOMPtr<imgIContainer> image;
+  nsresult rv = aRequest->GetImage(getter_AddRefs(image));
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+
+  int32_t width = 0, height = 0;
+  const int32_t kBytesPerPixel = 4;
+  // DBUS_MAXIMUM_ARRAY_LENGTH is 64M, there is 60 bytes overhead
+  // for the hints array with only the image payload, 256 is used to give
+  // some breathing room.
+  const int32_t kMaxImageBytes = 64 * 1024 * 1024 - 256;
+  image->GetWidth(&width);
+  image->GetHeight(&height);
+  if (width * height * kBytesPerPixel > kMaxImageBytes) {
+    // The image won't fit in a dbus array
+    return nullptr;
+  }
+
+  return nsImageToPixbuf::ImageToPixbuf(image);
+}
+
+NS_IMPL_ISUPPORTS(nsAlertsIconListener, nsIAlertNotificationImageListener,
+                  nsIObserver, nsISupportsWeakReference)
+
+nsAlertsIconListener::nsAlertsIconListener(nsSystemAlertsService* aBackend,
+                                           const nsAString& aAlertName)
+    : mAlertName(aAlertName), mBackend(aBackend), mNotification(nullptr) {
+  if (!libNotifyHandle && !libNotifyNotAvail) {
+    libNotifyHandle = dlopen("libnotify.so.4", RTLD_LAZY);
+    if (!libNotifyHandle) {
+      libNotifyHandle = dlopen("libnotify.so.1", RTLD_LAZY);
+      if (!libNotifyHandle) {
+        libNotifyNotAvail = true;
+        return;
+      }
+    }
+
+    notify_is_initted =
+        (notify_is_initted_t)dlsym(libNotifyHandle, "notify_is_initted");
+    notify_init = (notify_init_t)dlsym(libNotifyHandle, "notify_init");
+    notify_get_server_caps = (notify_get_server_caps_t)dlsym(
+        libNotifyHandle, "notify_get_server_caps");
+    notify_notification_new = (notify_notification_new_t)dlsym(
+        libNotifyHandle, "notify_notification_new");
+    notify_notification_show = (notify_notification_show_t)dlsym(
+        libNotifyHandle, "notify_notification_show");
+    notify_notification_set_icon_from_pixbuf =
+        (notify_notification_set_icon_from_pixbuf_t)dlsym(
+            libNotifyHandle, "notify_notification_set_icon_from_pixbuf");
+    notify_notification_add_action = (notify_notification_add_action_t)dlsym(
+        libNotifyHandle, "notify_notification_add_action");
+    notify_notification_close = (notify_notification_close_t)dlsym(
+        libNotifyHandle, "notify_notification_close");
+    notify_notification_set_hint = (notify_notification_set_hint_t)dlsym(
+        libNotifyHandle, "notify_notification_set_hint");
+    if (!notify_is_initted || !notify_init || !notify_get_server_caps ||
+        !notify_notification_new || !notify_notification_show ||
+        !notify_notification_set_icon_from_pixbuf ||
+        !notify_notification_add_action || !notify_notification_close) {
+      dlclose(libNotifyHandle);
+      libNotifyHandle = nullptr;
+    }
+  }
+}
+
+nsAlertsIconListener::~nsAlertsIconListener() {
+  mBackend->RemoveListener(mAlertName, this);
+  // Don't dlclose libnotify as it uses atexit().
+}
+
+NS_IMETHODIMP
+nsAlertsIconListener::OnImageMissing(nsISupports*) {
+  // This notification doesn't have an image, or there was an error getting
+  // the image. Show the notification without an icon.
+  return ShowAlert(nullptr);
+}
+
+NS_IMETHODIMP
+nsAlertsIconListener::OnImageReady(nsISupports*, imgIRequest* aRequest) {
+  RefPtr<GdkPixbuf> imagePixbuf = GetPixbufFromImgRequest(aRequest);
+  ShowAlert(imagePixbuf);
+  return NS_OK;
+}
+
+nsresult nsAlertsIconListener::ShowAlert(GdkPixbuf* aPixbuf) {
+  if (!mBackend->IsActiveListener(mAlertName, this)) return NS_OK;
+
+  mNotification = notify_notification_new(mAlertTitle.get(), mAlertText.get(),
+                                          nullptr, nullptr);
+
+  if (!mNotification) return NS_ERROR_OUT_OF_MEMORY;
+
+  nsCOMPtr<nsIObserverService> obsServ =
+      do_GetService("@mozilla.org/observer-service;1");
+  if (obsServ) obsServ->AddObserver(this, "quit-application", true);
+
+  if (aPixbuf) notify_notification_set_icon_from_pixbuf(mNotification, aPixbuf);
+
+  NS_ADDREF(this);
+  if (mAlertHasAction) {
+    // What we put as the label doesn't matter here, if the action
+    // string is "default" then that makes the entire bubble clickable
+    // rather than creating a button.
+    notify_notification_add_action(mNotification, "default", "Activate",
+                                   notify_action_cb, this, nullptr);
+  }
+
+  if (notify_notification_set_hint) {
+    notify_notification_set_hint(mNotification, "suppress-sound",
+                                 g_variant_new_boolean(mAlertIsSilent));
+
+    // If MOZ_DESKTOP_FILE_NAME variable is set, use it as the application id,
+    // otherwise use gAppData->name
+    if (getenv("MOZ_DESKTOP_FILE_NAME")) {
+      // Send the desktop name to identify the application
+      // The desktop-entry is the part before the .desktop
+      notify_notification_set_hint(
+          mNotification, "desktop-entry",
+          g_variant_new("s", getenv("MOZ_DESKTOP_FILE_NAME")));
+    } else {
+      notify_notification_set_hint(mNotification, "desktop-entry",
+                                   g_variant_new("s", gAppData->remotingName));
+    }
+  }
+
+  // Fedora 10 calls NotifyNotification "closed" signal handlers with a
+  // different signature, so a marshaller is used instead of a C callback to
+  // get the user_data (this) in a parseable format.  |closure| is created
+  // with a floating reference, which gets sunk by g_signal_connect_closure().
+  GClosure* closure = g_closure_new_simple(sizeof(GClosure), this);
+  g_closure_set_marshal(closure, notify_closed_marshal);
+  mClosureHandler =
+      g_signal_connect_closure(mNotification, "closed", closure, FALSE);
+  GUniquePtr<GError> error;
+  if (!notify_notification_show(mNotification, getter_Transfers(error))) {
+    NS_WARNING(error->message);
+    return NS_ERROR_FAILURE;
+  }
+
+  if (mAlertListener)
+    mAlertListener->Observe(nullptr, "alertshow", mAlertCookie.get());
+
+  return NS_OK;
+}
+
+void nsAlertsIconListener::SendCallback() {
+  if (mAlertListener)
+    mAlertListener->Observe(nullptr, "alertclickcallback", mAlertCookie.get());
+}
+
+void nsAlertsIconListener::SendClosed() {
+  if (mNotification) {
+    g_object_unref(mNotification);
+    mNotification = nullptr;
+  }
+  NotifyFinished();
+}
+
+NS_IMETHODIMP
+nsAlertsIconListener::Observe(nsISupports* aSubject, const char* aTopic,
+                              const char16_t* aData) {
+  // We need to close any open notifications upon application exit, otherwise
+  // we will leak since libnotify holds a ref for us.
+  if (!nsCRT::strcmp(aTopic, "quit-application") && mNotification) {
+    g_signal_handler_disconnect(mNotification, mClosureHandler);
+    g_object_unref(mNotification);
+    mNotification = nullptr;
+    Release();  // equivalent to NS_RELEASE(this)
+  }
+  return NS_OK;
+}
+
+nsresult nsAlertsIconListener::Close() {
+  if (mIconRequest) {
+    mIconRequest->Cancel(NS_BINDING_ABORTED);
+    mIconRequest = nullptr;
+  }
+
+  if (!mNotification) {
+    NotifyFinished();
+    return NS_OK;
+  }
+
+  GUniquePtr<GError> error;
+  if (!notify_notification_close(mNotification, getter_Transfers(error))) {
+    NS_WARNING(error->message);
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+nsresult nsAlertsIconListener::InitAlertAsync(nsIAlertNotification* aAlert,
+                                              nsIObserver* aAlertListener) {
+  if (!libNotifyHandle) return NS_ERROR_FAILURE;
+
+  if (!notify_is_initted()) {
+    // Give the name of this application to libnotify
+    nsCOMPtr<nsIStringBundleService> bundleService =
+        do_GetService(NS_STRINGBUNDLE_CONTRACTID);
+
+    nsAutoCString appShortName;
+    if (bundleService) {
+      nsCOMPtr<nsIStringBundle> bundle;
+      bundleService->CreateBundle("chrome://branding/locale/brand.properties",
+                                  getter_AddRefs(bundle));
+      nsAutoString appName;
+
+      if (bundle) {
+        bundle->GetStringFromName("brandShortName", appName);
+        CopyUTF16toUTF8(appName, appShortName);
+      } else {
+        NS_WARNING(
+            "brand.properties not present, using default application name");
+        appShortName.AssignLiteral("Mozilla");
+      }
+    } else {
+      appShortName.AssignLiteral("Mozilla");
+    }
+
+    if (!notify_init(appShortName.get())) return NS_ERROR_FAILURE;
+
+    GList* server_caps = notify_get_server_caps();
+    if (server_caps) {
+      gHasCaps = true;
+      for (GList* cap = server_caps; cap != nullptr; cap = cap->next) {
+        if (!strcmp((char*)cap->data, "actions")) {
+          gHasActions = true;
+          break;
+        }
+      }
+      g_list_foreach(server_caps, (GFunc)g_free, nullptr);
+      g_list_free(server_caps);
+    }
+  }
+
+  if (!gHasCaps) {
+    // if notify_get_server_caps() failed above we need to assume
+    // there is no notification-server to display anything
+    return NS_ERROR_FAILURE;
+  }
+
+  nsresult rv = aAlert->GetTextClickable(&mAlertHasAction);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!gHasActions && mAlertHasAction)
+    return NS_ERROR_FAILURE;  // No good, fallback to XUL
+
+  rv = aAlert->GetSilent(&mAlertIsSilent);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoString title;
+  rv = aAlert->GetTitle(title);
+  NS_ENSURE_SUCCESS(rv, rv);
+  // Workaround for a libnotify bug - blank titles aren't dealt with
+  // properly so we use a space
+  if (title.IsEmpty()) {
+    mAlertTitle = " "_ns;
+  } else {
+    CopyUTF16toUTF8(title, mAlertTitle);
+  }
+
+  nsAutoString text;
+  rv = aAlert->GetText(text);
+  NS_ENSURE_SUCCESS(rv, rv);
+  CopyUTF16toUTF8(text, mAlertText);
+
+  mAlertListener = aAlertListener;
+
+  rv = aAlert->GetCookie(mAlertCookie);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return aAlert->LoadImage(/* aTimeout = */ 0, this, /* aUserData = */ nullptr,
+                           getter_AddRefs(mIconRequest));
+}
+
+void nsAlertsIconListener::NotifyFinished() {
+  if (mAlertListener)
+    mAlertListener->Observe(nullptr, "alertfinished", mAlertCookie.get());
+}
diff --git a/toolkit/system/gnome/nsAlertsIconListener.h b/toolkit/system/gnome/nsAlertsIconListener.h
new file mode 100644
index 0000000000..e5e7b63301
--- /dev/null
+++ b/toolkit/system/gnome/nsAlertsIconListener.h
@@ -0,0 +1,101 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsAlertsIconListener_h__
+#define nsAlertsIconListener_h__
+
+#include "nsCOMPtr.h"
+#include "nsIAlertsService.h"
+#include "nsString.h"
+#include "nsIObserver.h"
+#include "nsWeakReference.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+class nsIAlertNotification;
+class nsICancelable;
+class nsSystemAlertsService;
+
+struct NotifyNotification;
+
+class nsAlertsIconListener : public nsIAlertNotificationImageListener,
+                             public nsIObserver,
+                             public nsSupportsWeakReference {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIALERTNOTIFICATIONIMAGELISTENER
+  NS_DECL_NSIOBSERVER
+
+  nsAlertsIconListener(nsSystemAlertsService* aBackend,
+                       const nsAString& aAlertName);
+
+  nsresult InitAlertAsync(nsIAlertNotification* aAlert,
+                          nsIObserver* aAlertListener);
+  nsresult Close();
+
+  void SendCallback();
+  void SendClosed();
+
+ protected:
+  virtual ~nsAlertsIconListener();
+
+  /**
+   * The only difference between libnotify.so.4 and libnotify.so.1 for these
+   * symbols is that notify_notification_new takes three arguments in
+   * libnotify.so.4 and four in libnotify.so.1. Passing the fourth argument as
+   * NULL is binary compatible.
+   */
+  typedef void (*NotifyActionCallback)(NotifyNotification*, char*, gpointer);
+  typedef bool (*notify_is_initted_t)(void);
+  typedef bool (*notify_init_t)(const char*);
+  typedef GList* (*notify_get_server_caps_t)(void);
+  typedef NotifyNotification* (*notify_notification_new_t)(const char*,
+                                                           const char*,
+                                                           const char*,
+                                                           const char*);
+  typedef bool (*notify_notification_show_t)(void*, GError**);
+  typedef void (*notify_notification_set_icon_from_pixbuf_t)(void*, GdkPixbuf*);
+  typedef void (*notify_notification_add_action_t)(void*, const char*,
+                                                   const char*,
+                                                   NotifyActionCallback,
+                                                   gpointer, GFreeFunc);
+  typedef bool (*notify_notification_close_t)(void*, GError**);
+  typedef void (*notify_notification_set_hint_t)(NotifyNotification*,
+                                                 const char*, GVariant*);
+
+  nsCOMPtr<nsICancelable> mIconRequest;
+  nsCString mAlertTitle;
+  nsCString mAlertText;
+
+  nsCOMPtr<nsIObserver> mAlertListener;
+  nsString mAlertCookie;
+  nsString mAlertName;
+
+  RefPtr<nsSystemAlertsService> mBackend;
+
+  bool mAlertHasAction;
+  bool mAlertIsSilent;
+
+  static void* libNotifyHandle;
+  static bool libNotifyNotAvail;
+  static notify_is_initted_t notify_is_initted;
+  static notify_init_t notify_init;
+  static notify_get_server_caps_t notify_get_server_caps;
+  static notify_notification_new_t notify_notification_new;
+  static notify_notification_show_t notify_notification_show;
+  static notify_notification_set_icon_from_pixbuf_t
+      notify_notification_set_icon_from_pixbuf;
+  static notify_notification_add_action_t notify_notification_add_action;
+  static notify_notification_close_t notify_notification_close;
+  static notify_notification_set_hint_t notify_notification_set_hint;
+  NotifyNotification* mNotification;
+  gulong mClosureHandler;
+
+  nsresult ShowAlert(GdkPixbuf* aPixbuf);
+
+  void NotifyFinished();
+};
+
+#endif
diff --git a/toolkit/system/gnome/nsGIOService.cpp b/toolkit/system/gnome/nsGIOService.cpp
new file mode 100644
index 0000000000..a48e80d0d6
--- /dev/null
+++ b/toolkit/system/gnome/nsGIOService.cpp
@@ -0,0 +1,946 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsGIOService.h"
+#include "nsString.h"
+#include "nsIURI.h"
+#include "nsIFile.h"
+#include "nsTArray.h"
+#include "nsStringEnumerator.h"
+#include "nsIMIMEInfo.h"
+#include "nsComponentManagerUtils.h"
+#include "nsArray.h"
+#include "nsPrintfCString.h"
+#include "mozilla/GRefPtr.h"
+#include "mozilla/GUniquePtr.h"
+#include "mozilla/UniquePtrExtensions.h"
+#include "mozilla/WidgetUtilsGtk.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/StaticPrefs_widget.h"
+#include "mozilla/net/DNS.h"
+#include "prenv.h"
+
+#include <gio/gio.h>
+#include <gtk/gtk.h>
+#ifdef MOZ_ENABLE_DBUS
+#  include <fcntl.h>
+#  include <dlfcn.h>
+#  include "mozilla/widget/AsyncDBus.h"
+#  include "mozilla/WidgetUtilsGtk.h"
+#endif
+
+using namespace mozilla;
+
+class nsFlatpakHandlerApp : public nsIHandlerApp {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIHANDLERAPP
+  nsFlatpakHandlerApp() = default;
+
+ private:
+  virtual ~nsFlatpakHandlerApp() = default;
+};
+
+NS_IMPL_ISUPPORTS(nsFlatpakHandlerApp, nsIHandlerApp)
+
+NS_IMETHODIMP
+nsFlatpakHandlerApp::GetName(nsAString& aName) {
+  aName.AssignLiteral("System Handler");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFlatpakHandlerApp::SetName(const nsAString& aName) {
+  // We don't implement SetName because flatpak system handler name is fixed
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsFlatpakHandlerApp::GetDetailedDescription(nsAString& aDetailedDescription) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsFlatpakHandlerApp::SetDetailedDescription(
+    const nsAString& aDetailedDescription) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsFlatpakHandlerApp::Equals(nsIHandlerApp* aHandlerApp, bool* _retval) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsFlatpakHandlerApp::LaunchWithURI(
+    nsIURI* aUri, mozilla::dom::BrowsingContext* aBrowsingContext) {
+  nsCString spec;
+  aUri->GetSpec(spec);
+  GUniquePtr<GError> error;
+
+  // The TMPDIR where files are downloaded when user choose to open them
+  // needs to be accessible from sandbox and host. The default settings
+  // TMPDIR=/tmp is accessible only to the sandbox. That can be the reason
+  // why the gtk_show_uri fails there.
+  // The workaround is to set TMPDIR environment variable in sandbox to
+  // $XDG_CACHE_HOME/tmp before executing Firefox.
+  gtk_show_uri(nullptr, spec.get(), GDK_CURRENT_TIME, getter_Transfers(error));
+  if (error) {
+    NS_WARNING(
+        nsPrintfCString("Cannot launch flatpak handler: %s", error->message)
+            .get());
+    return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+
+/**
+ * Get command without any additional arguments
+ * @param aCommandWithArguments full commandline input string
+ * @param aCommand string for storing command without arguments
+ * @return NS_ERROR_FAILURE when unable to parse commandline
+ */
+static nsresult GetCommandFromCommandline(
+    nsACString const& aCommandWithArguments, nsACString& aCommand) {
+  GUniquePtr<GError> error;
+  gchar** argv = nullptr;
+  if (!g_shell_parse_argv(aCommandWithArguments.BeginReading(), nullptr, &argv,
+                          getter_Transfers(error)) ||
+      !argv[0]) {
+    g_warning("Cannot parse command with arguments: %s", error->message);
+    g_strfreev(argv);
+    return NS_ERROR_FAILURE;
+  }
+  aCommand.Assign(argv[0]);
+  g_strfreev(argv);
+  return NS_OK;
+}
+
+class nsGIOMimeApp final : public nsIGIOMimeApp {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIHANDLERAPP
+  NS_DECL_NSIGIOMIMEAPP
+
+  explicit nsGIOMimeApp(already_AddRefed<GAppInfo> aApp) : mApp(aApp) {}
+
+ private:
+  ~nsGIOMimeApp() = default;
+
+  RefPtr<GAppInfo> mApp;
+};
+
+NS_IMPL_ISUPPORTS(nsGIOMimeApp, nsIGIOMimeApp, nsIHandlerApp)
+
+NS_IMETHODIMP
+nsGIOMimeApp::GetId(nsACString& aId) {
+  aId.Assign(g_app_info_get_id(mApp));
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::GetName(nsAString& aName) {
+  aName.Assign(NS_ConvertUTF8toUTF16(g_app_info_get_name(mApp)));
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::SetName(const nsAString& aName) {
+  // We don't implement SetName because we're using mGIOMimeApp instance for
+  // obtaining application name
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::GetCommand(nsACString& aCommand) {
+  const char* cmd = g_app_info_get_commandline(mApp);
+  if (!cmd) return NS_ERROR_FAILURE;
+  aCommand.Assign(cmd);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::GetExpectsURIs(int32_t* aExpects) {
+  *aExpects = g_app_info_supports_uris(mApp);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::GetDetailedDescription(nsAString& aDetailedDescription) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::SetDetailedDescription(const nsAString& aDetailedDescription) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::Equals(nsIHandlerApp* aHandlerApp, bool* _retval) {
+  if (!aHandlerApp) return NS_ERROR_FAILURE;
+
+  // Compare with nsILocalHandlerApp instance by name
+  nsCOMPtr<nsILocalHandlerApp> localHandlerApp = do_QueryInterface(aHandlerApp);
+  if (localHandlerApp) {
+    nsAutoString theirName;
+    nsAutoString thisName;
+    GetName(thisName);
+    localHandlerApp->GetName(theirName);
+    *_retval = thisName.Equals(theirName);
+    return NS_OK;
+  }
+
+  // Compare with nsIGIOMimeApp instance by command with stripped arguments
+  nsCOMPtr<nsIGIOMimeApp> gioMimeApp = do_QueryInterface(aHandlerApp);
+  if (gioMimeApp) {
+    nsAutoCString thisCommandline, thisCommand;
+    nsresult rv = GetCommand(thisCommandline);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = GetCommandFromCommandline(thisCommandline, thisCommand);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsAutoCString theirCommandline, theirCommand;
+    gioMimeApp->GetCommand(theirCommandline);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = GetCommandFromCommandline(theirCommandline, theirCommand);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    *_retval = thisCommand.Equals(theirCommand);
+    return NS_OK;
+  }
+
+  // We can only compare with nsILocalHandlerApp and nsGIOMimeApp
+  *_retval = false;
+  return NS_OK;
+}
+
+static RefPtr<GAppLaunchContext> GetLaunchContext(
+    const char* aXDGToken = nullptr) {
+  RefPtr<GAppLaunchContext> context = dont_AddRef(g_app_launch_context_new());
+  // Unset this before launching third-party MIME handlers. Otherwise, if
+  // Thunderbird sets this in its startup script (as it does in Debian and
+  // Fedora), and Firefox does not set this in its startup script (it doesn't in
+  // Debian), then Firefox will think it is part of Thunderbird and try to make
+  // Thunderbird the default browser. See bug 1494436.
+  g_app_launch_context_unsetenv(context, "MOZ_APP_LAUNCHER");
+  if (aXDGToken) {
+    g_app_launch_context_setenv(context, "XDG_ACTIVATION_TOKEN", aXDGToken);
+  }
+  return context;
+}
+
+#ifdef __OpenBSD__
+// wrappers required for OpenBSD sandboxing with unveil()
+gboolean g_app_info_launch_uris_openbsd(GAppInfo* mApp, const char* uri,
+                                        GAppLaunchContext* context,
+                                        GError** error) {
+  gchar* path = g_filename_from_uri(uri, NULL, NULL);
+  auto releasePath = MakeScopeExit([&] { g_free(path); });
+  const gchar* bin = g_app_info_get_executable(mApp);
+  if (!bin) {
+    g_set_error(error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                "no executable found for %s, maybe not unveiled ?",
+                g_app_info_get_name(mApp));
+    return FALSE;
+  }
+  g_debug("spawning %s %s for %s", bin, path, uri);
+  const gchar* const argv[] = {bin, path, NULL};
+
+  GSpawnFlags flags =
+      static_cast<GSpawnFlags>(G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD);
+  gboolean result =
+      g_spawn_async(NULL, (char**)argv, NULL, flags, NULL, NULL, NULL, error);
+
+  if (!result) {
+    g_warning("Cannot launch application %s with arg %s: %s", bin, path,
+              (*error)->message);
+    return FALSE;
+  }
+  return TRUE;
+}
+
+gboolean g_app_info_launch_default_for_uri_openbsd(const char* uri,
+                                                   GAppLaunchContext* context,
+                                                   GError** error) {
+  gboolean result_uncertain;
+  gchar* path = g_filename_from_uri(uri, NULL, NULL);
+  gchar* content_type = g_content_type_guess(path, NULL, 0, &result_uncertain);
+  gchar* scheme = g_uri_parse_scheme(uri);
+  auto release = MakeScopeExit([&] {
+    g_free(path);
+    g_free(content_type);
+    g_free(scheme);
+  });
+  if (g_strcmp0(scheme, "http") == 0 || g_strcmp0(scheme, "https") == 0)
+    return g_app_info_launch_default_for_uri(uri, context, error);
+
+  if (content_type != NULL && !result_uncertain) {
+    g_debug("content type for %s: %s", uri, content_type);
+    GAppInfo* app_info = g_app_info_get_default_for_type(content_type, false);
+    auto releaseAppInfo = MakeScopeExit([&] {
+      if (app_info) g_object_unref(app_info);
+    });
+    if (!app_info) {
+      g_set_error(error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                  "Could not find default handler for content type %s",
+                  content_type);
+      return FALSE;
+    } else {
+      return g_app_info_launch_uris_openbsd(app_info, uri, context, error);
+    }
+  } else {
+    g_set_error(error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                "Could not find content type for URI: %s", uri);
+    return FALSE;
+  }
+}
+#endif
+
+static NS_IMETHODIMP LaunchWithURIImpl(RefPtr<GAppInfo> aInfo, nsIURI* aUri,
+                                       const char* aXDGToken = nullptr) {
+  GList uris = {0};
+  nsCString spec;
+  aUri->GetSpec(spec);
+  // nsPromiseFlatCString flatUri(aUri);
+  uris.data = const_cast<char*>(spec.get());
+
+  GUniquePtr<GError> error;
+#ifdef __OpenBSD__
+  gboolean result = g_app_info_launch_uris_openbsd(
+      aInfo, spec.get(), GetLaunchContext(aXDGToken).get(),
+      getter_Transfers(error));
+#else
+  gboolean result = g_app_info_launch_uris(
+      aInfo, &uris, GetLaunchContext(aXDGToken).get(), getter_Transfers(error));
+#endif
+  if (!result) {
+    g_warning("Cannot launch application: %s", error->message);
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::LaunchWithURI(nsIURI* aUri,
+                            mozilla::dom::BrowsingContext* aBrowsingContext) {
+  auto promise = mozilla::widget::RequestWaylandFocusPromise();
+  if (!promise) {
+    return LaunchWithURIImpl(mApp, aUri);
+  }
+  promise->Then(
+      GetMainThreadSerialEventTarget(), __func__,
+      /* resolve */
+      [app = RefPtr{mApp}, uri = RefPtr{aUri}](nsCString token) {
+        LaunchWithURIImpl(app, uri, token.get());
+      },
+      /* reject */
+      [app = RefPtr{mApp}, uri = RefPtr{aUri}](bool state) {
+        LaunchWithURIImpl(app, uri);
+      });
+  return NS_OK;
+}
+
+class GIOUTF8StringEnumerator final : public nsStringEnumeratorBase {
+  ~GIOUTF8StringEnumerator() = default;
+
+ public:
+  GIOUTF8StringEnumerator() : mIndex(0) {}
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIUTF8STRINGENUMERATOR
+
+  using nsStringEnumeratorBase::GetNext;
+
+  nsTArray<nsCString> mStrings;
+  uint32_t mIndex;
+};
+
+NS_IMPL_ISUPPORTS(GIOUTF8StringEnumerator, nsIUTF8StringEnumerator,
+                  nsIStringEnumerator)
+
+NS_IMETHODIMP
+GIOUTF8StringEnumerator::HasMore(bool* aResult) {
+  *aResult = mIndex < mStrings.Length();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOUTF8StringEnumerator::GetNext(nsACString& aResult) {
+  if (mIndex >= mStrings.Length()) return NS_ERROR_UNEXPECTED;
+
+  aResult.Assign(mStrings[mIndex]);
+  ++mIndex;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::GetSupportedURISchemes(nsIUTF8StringEnumerator** aSchemes) {
+  *aSchemes = nullptr;
+
+  RefPtr<GIOUTF8StringEnumerator> array = new GIOUTF8StringEnumerator();
+
+  GVfs* gvfs = g_vfs_get_default();
+
+  if (!gvfs) {
+    g_warning("Cannot get GVfs object.");
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  const gchar* const* uri_schemes = g_vfs_get_supported_uri_schemes(gvfs);
+
+  while (*uri_schemes != nullptr) {
+    // XXX(Bug 1631371) Check if this should use a fallible operation as it
+    // pretended earlier.
+    array->mStrings.AppendElement(*uri_schemes);
+    uri_schemes++;
+  }
+
+  array.forget(aSchemes);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOMimeApp::SetAsDefaultForMimeType(nsACString const& aMimeType) {
+  GUniquePtr<char> content_type(
+      g_content_type_from_mime_type(PromiseFlatCString(aMimeType).get()));
+  if (!content_type) return NS_ERROR_FAILURE;
+  GUniquePtr<GError> error;
+  g_app_info_set_as_default_for_type(mApp, content_type.get(),
+                                     getter_Transfers(error));
+  if (error) {
+    g_warning("Cannot set application as default for MIME type (%s): %s",
+              PromiseFlatCString(aMimeType).get(), error->message);
+    return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+/**
+ * Set default application for files with given extensions
+ * @param fileExts string of space separated extensions
+ * @return NS_OK when application was set as default for given extensions,
+ * NS_ERROR_FAILURE otherwise
+ */
+NS_IMETHODIMP
+nsGIOMimeApp::SetAsDefaultForFileExtensions(nsACString const& fileExts) {
+  GUniquePtr<GError> error;
+  GUniquePtr<char> extensions(g_strdup(PromiseFlatCString(fileExts).get()));
+  char* ext_pos = extensions.get();
+  char* space_pos;
+
+  while ((space_pos = strchr(ext_pos, ' ')) || (*ext_pos != '\0')) {
+    if (space_pos) {
+      *space_pos = '\0';
+    }
+    g_app_info_set_as_default_for_extension(mApp, ext_pos,
+                                            getter_Transfers(error));
+    if (error) {
+      g_warning("Cannot set application as default for extension (%s): %s",
+                ext_pos, error->message);
+      return NS_ERROR_FAILURE;
+    }
+    if (space_pos) {
+      ext_pos = space_pos + 1;
+    } else {
+      *ext_pos = '\0';
+    }
+  }
+  return NS_OK;
+}
+
+/**
+ * Set default application for URI's of a particular scheme
+ * @param aURIScheme string containing the URI scheme
+ * @return NS_OK when application was set as default for URI scheme,
+ * NS_ERROR_FAILURE otherwise
+ */
+NS_IMETHODIMP
+nsGIOMimeApp::SetAsDefaultForURIScheme(nsACString const& aURIScheme) {
+  GUniquePtr<GError> error;
+  nsAutoCString contentType("x-scheme-handler/");
+  contentType.Append(aURIScheme);
+
+  g_app_info_set_as_default_for_type(mApp, contentType.get(),
+                                     getter_Transfers(error));
+  if (error) {
+    g_warning("Cannot set application as default for URI scheme (%s): %s",
+              PromiseFlatCString(aURIScheme).get(), error->message);
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(nsGIOService, nsIGIOService)
+
+NS_IMETHODIMP
+nsGIOService::GetMimeTypeFromExtension(const nsACString& aExtension,
+                                       nsACString& aMimeType) {
+  nsAutoCString fileExtToUse("file.");
+  fileExtToUse.Append(aExtension);
+
+  gboolean result_uncertain;
+  GUniquePtr<char> content_type(
+      g_content_type_guess(fileExtToUse.get(), nullptr, 0, &result_uncertain));
+  if (!content_type) {
+    return NS_ERROR_FAILURE;
+  }
+
+  GUniquePtr<char> mime_type(g_content_type_get_mime_type(content_type.get()));
+  if (!mime_type) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aMimeType.Assign(mime_type.get());
+  return NS_OK;
+}
+// used in nsGNOMERegistry
+// -----------------------------------------------------------------------------
+NS_IMETHODIMP
+nsGIOService::GetAppForURIScheme(const nsACString& aURIScheme,
+                                 nsIHandlerApp** aApp) {
+  *aApp = nullptr;
+
+  // Application in flatpak sandbox does not have access to the list
+  // of installed applications on the system. We use generic
+  // nsFlatpakHandlerApp which forwards launch call to the system.
+  if (widget::ShouldUsePortal(widget::PortalKind::MimeHandler)) {
+    if (mozilla::net::IsLoopbackHostname(aURIScheme)) {
+      // When the user writes foo:1234, we try to handle it natively using
+      // GetAppForURIScheme, and if that fails, we carry on. On flatpak there's
+      // no way to know if an app has handlers or not. Some things like
+      // localhost:1234 are really unlikely to be handled by native
+      // apps, and we're much better off returning an error here instead.
+      return NS_ERROR_FAILURE;
+    }
+    RefPtr<nsFlatpakHandlerApp> mozApp = new nsFlatpakHandlerApp();
+    mozApp.forget(aApp);
+    return NS_OK;
+  }
+
+  RefPtr<GAppInfo> app_info = dont_AddRef(g_app_info_get_default_for_uri_scheme(
+      PromiseFlatCString(aURIScheme).get()));
+  if (!app_info) {
+    return NS_ERROR_FAILURE;
+  }
+  RefPtr<nsGIOMimeApp> mozApp = new nsGIOMimeApp(app_info.forget());
+  mozApp.forget(aApp);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOService::GetAppsForURIScheme(const nsACString& aURIScheme,
+                                  nsIMutableArray** aResult) {
+  // We don't need to return the nsFlatpakHandlerApp here because
+  // it would be skipped by the callers anyway.
+  // The preferred handler is provided by GetAppForURIScheme.
+  // This method returns all possible application handlers
+  // including preferred one. The callers skips the preferred
+  // handler in this list to avoid duplicate records in the list
+  // they create.
+  nsCOMPtr<nsIMutableArray> handlersArray =
+      do_CreateInstance(NS_ARRAY_CONTRACTID);
+
+  nsAutoCString contentType("x-scheme-handler/");
+  contentType.Append(aURIScheme);
+
+  GList* appInfoList = g_app_info_get_all_for_type(contentType.get());
+  // g_app_info_get_all_for_type returns NULL when no appinfo is found
+  // or error occurs (contentType is NULL). We are fine with empty app list
+  // and we're sure that contentType is not NULL, so we won't return failure.
+  if (appInfoList) {
+    GList* appInfo = appInfoList;
+    while (appInfo) {
+      nsCOMPtr<nsIGIOMimeApp> mimeApp =
+          new nsGIOMimeApp(dont_AddRef(G_APP_INFO(appInfo->data)));
+      handlersArray->AppendElement(mimeApp);
+      appInfo = appInfo->next;
+    }
+    g_list_free(appInfoList);
+  }
+  handlersArray.forget(aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOService::GetAppForMimeType(const nsACString& aMimeType,
+                                nsIHandlerApp** aApp) {
+  *aApp = nullptr;
+
+  // Flatpak does not reveal installed application to the sandbox,
+  // we need to create generic system handler.
+  if (widget::ShouldUsePortal(widget::PortalKind::MimeHandler)) {
+    RefPtr<nsFlatpakHandlerApp> mozApp = new nsFlatpakHandlerApp();
+    mozApp.forget(aApp);
+    return NS_OK;
+  }
+
+  GUniquePtr<char> content_type(
+      g_content_type_from_mime_type(PromiseFlatCString(aMimeType).get()));
+  if (!content_type) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // GIO returns "unknown" appinfo for the application/octet-stream, which is
+  // useless. It's better to fallback to create appinfo from file extension
+  // later.
+  if (g_content_type_is_unknown(content_type.get())) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  RefPtr<GAppInfo> app_info =
+      dont_AddRef(g_app_info_get_default_for_type(content_type.get(), false));
+  if (!app_info) {
+    return NS_ERROR_FAILURE;
+  }
+#ifdef __OpenBSD__
+  char* t;
+  t = g_find_program_in_path(g_app_info_get_executable(app_info));
+  if (t != nullptr) {
+    g_debug("%s is registered as handler for %s, binary available as %s",
+            g_app_info_get_executable(app_info), content_type.get(), t);
+  } else {
+    g_warning(
+        "%s is registered as handler for %s but not available in PATH "
+        "(missing unveil ?)",
+        g_app_info_get_executable(app_info), content_type.get());
+  }
+#endif
+  RefPtr<nsGIOMimeApp> mozApp = new nsGIOMimeApp(app_info.forget());
+  mozApp.forget(aApp);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOService::GetDescriptionForMimeType(const nsACString& aMimeType,
+                                        nsACString& aDescription) {
+  GUniquePtr<char> content_type(
+      g_content_type_from_mime_type(PromiseFlatCString(aMimeType).get()));
+  if (!content_type) {
+    return NS_ERROR_FAILURE;
+  }
+
+  GUniquePtr<char> desc(g_content_type_get_description(content_type.get()));
+  if (!desc) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aDescription.Assign(desc.get());
+  return NS_OK;
+}
+
+static nsresult ShowURIImpl(nsIURI* aURI, const char* aXDGToken = nullptr) {
+  nsAutoCString spec;
+  MOZ_TRY(aURI->GetSpec(spec));
+  GUniquePtr<GError> error;
+#ifdef __OpenBSD__
+  if (!g_app_info_launch_default_for_uri_openbsd(
+          spec.get(), GetLaunchContext(aXDGToken).get(),
+#else
+  if (!g_app_info_launch_default_for_uri(spec.get(),
+                                         GetLaunchContext(aXDGToken).get(),
+#endif
+          getter_Transfers(error))) {
+    g_warning("Could not launch default application for URI: %s",
+              error->message);
+    return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+
+nsresult nsGIOService::ShowURI(nsIURI* aURI) {
+  auto promise = mozilla::widget::RequestWaylandFocusPromise();
+  if (!promise) {
+    return ShowURIImpl(aURI);
+  }
+  promise->Then(
+      GetMainThreadSerialEventTarget(), __func__,
+      /* resolve */
+      [uri = RefPtr{aURI}](nsCString token) { ShowURIImpl(uri, token.get()); },
+      /* reject */
+      [uri = RefPtr{aURI}](bool state) { ShowURIImpl(uri); });
+  return NS_OK;
+}
+
+static nsresult LaunchPathImpl(const nsACString& aPath,
+                               const char* aXDGToken = nullptr) {
+  RefPtr<GFile> file = dont_AddRef(
+      g_file_new_for_commandline_arg(PromiseFlatCString(aPath).get()));
+  GUniquePtr<char> spec(g_file_get_uri(file));
+  GUniquePtr<GError> error;
+#ifdef __OpenBSD__
+  g_app_info_launch_default_for_uri_openbsd(spec.get(),
+                                            GetLaunchContext(aXDGToken).get(),
+#else
+  g_app_info_launch_default_for_uri(spec.get(),
+                                    GetLaunchContext(aXDGToken).get(),
+#endif
+                                            getter_Transfers(error));
+  if (error) {
+    g_warning("Cannot launch default application: %s", error->message);
+    return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+
+static nsresult LaunchPath(const nsACString& aPath) {
+  auto promise = mozilla::widget::RequestWaylandFocusPromise();
+  if (!promise) {
+    return LaunchPathImpl(aPath);
+  }
+  promise->Then(
+      GetMainThreadSerialEventTarget(), __func__,
+      /* resolve */
+      [path = nsCString{aPath}](nsCString token) {
+        LaunchPathImpl(path, token.get());
+      },
+      /* reject */
+      [path = nsCString{aPath}](bool state) { LaunchPathImpl(path); });
+  return NS_OK;
+}
+
+nsresult nsGIOService::LaunchFile(const nsACString& aPath) {
+  return LaunchPath(aPath);
+}
+
+nsresult nsGIOService::GetIsRunningUnderFlatpak(bool* aResult) {
+  *aResult = mozilla::widget::IsRunningUnderFlatpak();
+  return NS_OK;
+}
+
+static nsresult RevealDirectory(nsIFile* aFile, bool aForce) {
+  nsAutoCString path;
+  if (bool isDir; NS_SUCCEEDED(aFile->IsDirectory(&isDir)) && isDir) {
+    MOZ_TRY(aFile->GetNativePath(path));
+    return LaunchPath(path);
+  }
+
+  if (!aForce) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIFile> parentDir;
+  MOZ_TRY(aFile->GetParent(getter_AddRefs(parentDir)));
+  MOZ_TRY(parentDir->GetNativePath(path));
+  return LaunchPath(path);
+}
+
+#ifdef MOZ_ENABLE_DBUS
+// Classic DBus
+const char kFreedesktopFileManagerName[] = "org.freedesktop.FileManager1";
+const char kFreedesktopFileManagerPath[] = "/org/freedesktop/FileManager1";
+const char kMethodShowItems[] = "ShowItems";
+
+// Portal for Snap, Flatpak
+const char kFreedesktopPortalName[] = "org.freedesktop.portal.Desktop";
+const char kFreedesktopPortalPath[] = "/org/freedesktop/portal/desktop";
+const char kFreedesktopPortalOpenURI[] = "org.freedesktop.portal.OpenURI";
+const char kMethodOpenDirectory[] = "OpenDirectory";
+
+static nsresult RevealFileViaDBusWithProxy(GDBusProxy* aProxy, nsIFile* aFile,
+                                           const char* aMethod) {
+  nsAutoCString path;
+  MOZ_TRY(aFile->GetNativePath(path));
+
+  RefPtr<mozilla::widget::DBusCallPromise> dbusPromise;
+  const char* startupId = "";
+
+  const int32_t timeout =
+      StaticPrefs::widget_gtk_file_manager_show_items_timeout_ms();
+
+  if (!(strcmp(aMethod, kMethodOpenDirectory) == 0)) {
+    GUniquePtr<gchar> uri(g_filename_to_uri(path.get(), nullptr, nullptr));
+    if (!uri) {
+      RevealDirectory(aFile, /* aForce = */ true);
+      return NS_ERROR_FAILURE;
+    }
+
+    GVariantBuilder builder;
+    g_variant_builder_init(&builder, G_VARIANT_TYPE_STRING_ARRAY);
+    g_variant_builder_add(&builder, "s", uri.get());
+
+    RefPtr<GVariant> variant = dont_AddRef(
+        g_variant_ref_sink(g_variant_new("(ass)", &builder, startupId)));
+    g_variant_builder_clear(&builder);
+
+    dbusPromise = widget::DBusProxyCall(aProxy, aMethod, variant,
+                                        G_DBUS_CALL_FLAGS_NONE, timeout);
+  } else {
+    int fd = open(path.get(), O_RDONLY | O_CLOEXEC);
+    if (fd < 0) {
+      g_printerr("Failed to open file: %s returned %d\n", path.get(), errno);
+      RevealDirectory(aFile, /* aForce = */ true);
+      return NS_ERROR_FAILURE;
+    }
+
+    GVariantBuilder options;
+    g_variant_builder_init(&options, G_VARIANT_TYPE_VARDICT);
+
+    static auto g_unix_fd_list_new_from_array =
+        (GUnixFDList * (*)(const gint* fds, gint n_fds))
+            dlsym(RTLD_DEFAULT, "g_unix_fd_list_new_from_array");
+
+    // Will take ownership of the fd, so we dont have to care about it anymore
+    RefPtr<GUnixFDList> fd_list =
+        dont_AddRef(g_unix_fd_list_new_from_array(&fd, 1));
+
+    RefPtr<GVariant> variant = dont_AddRef(
+        g_variant_ref_sink(g_variant_new("(sha{sv})", startupId, 0, &options)));
+    g_variant_builder_clear(&options);
+
+    dbusPromise = widget::DBusProxyCallWithUnixFDList(
+        aProxy, aMethod, variant, G_DBUS_CALL_FLAGS_NONE, timeout, fd_list);
+  }
+
+  dbusPromise->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [](RefPtr<GVariant>&& aResult) {
+        // Do nothing, file is shown, we're done.
+      },
+      [file = RefPtr{aFile}, aMethod](GUniquePtr<GError>&& aError) {
+        g_printerr("Failed to query file manager via %s: %s\n", aMethod,
+                   aError->message);
+        RevealDirectory(file, /* aForce = */ true);
+      });
+  return NS_OK;
+}
+
+static void RevealFileViaDBus(nsIFile* aFile, const char* aName,
+                              const char* aPath, const char* aCall,
+                              const char* aMethod) {
+  widget::CreateDBusProxyForBus(
+      G_BUS_TYPE_SESSION,
+      GDBusProxyFlags(G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS |
+                      G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES),
+      /* aInterfaceInfo = */ nullptr, aName, aPath, aCall)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [file = RefPtr{aFile}, aMethod](RefPtr<GDBusProxy>&& aProxy) {
+            RevealFileViaDBusWithProxy(aProxy.get(), file, aMethod);
+          },
+          [file = RefPtr{aFile}, aName](GUniquePtr<GError>&& aError) {
+            g_printerr("Failed to create DBUS proxy for %s: %s\n", aName,
+                       aError->message);
+            RevealDirectory(file, /* aForce = */ true);
+          });
+}
+
+static void RevealFileViaDBusClassic(nsIFile* aFile) {
+  RevealFileViaDBus(aFile, kFreedesktopFileManagerName,
+                    kFreedesktopFileManagerPath, kFreedesktopFileManagerName,
+                    kMethodShowItems);
+}
+
+static void RevealFileViaDBusPortal(nsIFile* aFile) {
+  RevealFileViaDBus(aFile, kFreedesktopPortalName, kFreedesktopPortalPath,
+                    kFreedesktopPortalOpenURI, kMethodOpenDirectory);
+}
+#endif
+
+nsresult nsGIOService::RevealFile(nsIFile* aFile) {
+#ifdef MOZ_ENABLE_DBUS
+  if (NS_SUCCEEDED(RevealDirectory(aFile, /* aForce = */ false))) {
+    return NS_OK;
+  }
+  if (ShouldUsePortal(widget::PortalKind::OpenUri)) {
+    RevealFileViaDBusPortal(aFile);
+  } else {
+    RevealFileViaDBusClassic(aFile);
+  }
+  return NS_OK;
+#else
+  return RevealDirectory(aFile, /* aForce = */ true);
+#endif
+}
+
+/**
+ * Find GIO Mime App from given commandline.
+ * This is different from CreateAppFromCommand because instead of creating the
+ * GIO Mime App in case it's not found in the GIO application list, the method
+ * returns error.
+ * @param aCmd command with parameters used to start the application
+ * @return NS_OK when application is found, NS_ERROR_NOT_AVAILABLE otherwise
+ */
+NS_IMETHODIMP
+nsGIOService::FindAppFromCommand(nsACString const& aCmd,
+                                 nsIGIOMimeApp** aAppInfo) {
+  RefPtr<GAppInfo> app_info;
+
+  GList* apps = g_app_info_get_all();
+
+  // Try to find relevant and existing GAppInfo in all installed application
+  // We do this by comparing each GAppInfo's executable with out own
+  for (GList* node = apps; node; node = node->next) {
+    RefPtr<GAppInfo> app_info_from_list = dont_AddRef((GAppInfo*)node->data);
+    node->data = nullptr;
+    if (!app_info) {
+      // If the executable is not absolute, get it's full path
+      GUniquePtr<char> executable(g_find_program_in_path(
+          g_app_info_get_executable(app_info_from_list)));
+
+      if (executable &&
+          strcmp(executable.get(), PromiseFlatCString(aCmd).get()) == 0) {
+        app_info = std::move(app_info_from_list);
+        // Can't break here because we need to keep iterating to unref the other
+        // nodes.
+      }
+    }
+  }
+
+  g_list_free(apps);
+  if (!app_info) {
+    *aAppInfo = nullptr;
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  RefPtr<nsGIOMimeApp> app = new nsGIOMimeApp(app_info.forget());
+  app.forget(aAppInfo);
+  return NS_OK;
+}
+
+/**
+ * Create application info for specified command and application name.
+ * Command arguments are ignored and the "%u" is always added.
+ * @param cmd command to execute
+ * @param appName application name
+ * @param appInfo location where created GAppInfo is stored
+ * @return NS_OK when object is created, NS_ERROR_FILE_NOT_FOUND when executable
+ * is not found in the system path or NS_ERROR_FAILURE otherwise.
+ */
+NS_IMETHODIMP
+nsGIOService::CreateAppFromCommand(nsACString const& cmd,
+                                   nsACString const& appName,
+                                   nsIGIOMimeApp** appInfo) {
+  *appInfo = nullptr;
+
+  // Using G_APP_INFO_CREATE_SUPPORTS_URIS calling
+  // g_app_info_create_from_commandline appends %u to the cmd even when cmd
+  // already contains this parameter. To avoid that we're going to remove
+  // arguments before passing to it.
+  nsAutoCString commandWithoutArgs;
+  nsresult rv = GetCommandFromCommandline(cmd, commandWithoutArgs);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  GUniquePtr<GError> error;
+  RefPtr<GAppInfo> app_info = dont_AddRef(g_app_info_create_from_commandline(
+      commandWithoutArgs.BeginReading(), PromiseFlatCString(appName).get(),
+      G_APP_INFO_CREATE_SUPPORTS_URIS, getter_Transfers(error)));
+  if (!app_info) {
+    g_warning("Cannot create application info from command: %s",
+              error->message);
+    return NS_ERROR_FAILURE;
+  }
+
+  // Check if executable exist in path
+  GUniquePtr<gchar> executableWithFullPath(
+      g_find_program_in_path(commandWithoutArgs.BeginReading()));
+  if (!executableWithFullPath) {
+    return NS_ERROR_FILE_NOT_FOUND;
+  }
+  RefPtr<nsGIOMimeApp> mozApp = new nsGIOMimeApp(app_info.forget());
+  mozApp.forget(appInfo);
+  return NS_OK;
+}
diff --git a/toolkit/system/gnome/nsGIOService.h b/toolkit/system/gnome/nsGIOService.h
new file mode 100644
index 0000000000..e83c724de2
--- /dev/null
+++ b/toolkit/system/gnome/nsGIOService.h
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsGIOService_h_
+#define nsGIOService_h_
+
+#include "nsIGIOService.h"
+
+#define NS_GIOSERVICE_CID                            \
+  {                                                  \
+    0xe3a1f3c9, 0x3ae1, 0x4b40, {                    \
+      0xa5, 0xe0, 0x7b, 0x45, 0x7f, 0xc9, 0xa9, 0xad \
+    }                                                \
+  }
+
+class nsGIOService final : public nsIGIOService {
+  ~nsGIOService() = default;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIGIOSERVICE
+};
+
+#endif
diff --git a/toolkit/system/gnome/nsGSettingsService.cpp b/toolkit/system/gnome/nsGSettingsService.cpp
new file mode 100644
index 0000000000..73cba5c947
--- /dev/null
+++ b/toolkit/system/gnome/nsGSettingsService.cpp
@@ -0,0 +1,316 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsGSettingsService.h"
+#include "nsString.h"
+#include "nsCOMPtr.h"
+#include "prlink.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIMutableArray.h"
+#include "nsISupportsPrimitives.h"
+
+#include <glib.h>
+#include <glib-object.h>
+
+using namespace mozilla;
+
+typedef struct _GSettings GSettings;
+typedef struct _GVariantType GVariantType;
+typedef struct _GVariant GVariant;
+
+#ifndef G_VARIANT_TYPE_INT32
+#  define G_VARIANT_TYPE_INT32 ((const GVariantType*)"i")
+#  define G_VARIANT_TYPE_BOOLEAN ((const GVariantType*)"b")
+#  define G_VARIANT_TYPE_STRING ((const GVariantType*)"s")
+#  define G_VARIANT_TYPE_OBJECT_PATH ((const GVariantType*)"o")
+#  define G_VARIANT_TYPE_SIGNATURE ((const GVariantType*)"g")
+#endif
+#ifndef G_VARIANT_TYPE_STRING_ARRAY
+#  define G_VARIANT_TYPE_STRING_ARRAY ((const GVariantType*)"as")
+#endif
+
+#define GSETTINGS_FUNCTIONS                                                   \
+  FUNC(g_settings_new, GSettings*, (const char* schema))                      \
+  FUNC(g_settings_list_schemas, const char* const*, (void))                   \
+  FUNC(g_settings_list_keys, char**, (GSettings * settings))                  \
+  FUNC(g_settings_get_value, GVariant*,                                       \
+       (GSettings * settings, const char* key))                               \
+  FUNC(g_settings_set_value, gboolean,                                        \
+       (GSettings * settings, const char* key, GVariant* value))              \
+  FUNC(g_settings_range_check, gboolean,                                      \
+       (GSettings * settings, const char* key, GVariant* value))              \
+  FUNC(g_variant_get_int32, gint32, (GVariant * variant))                     \
+  FUNC(g_variant_get_boolean, gboolean, (GVariant * variant))                 \
+  FUNC(g_variant_get_string, const char*, (GVariant * value, gsize * length)) \
+  FUNC(g_variant_get_strv, const char**, (GVariant * value, gsize * length))  \
+  FUNC(g_variant_is_of_type, gboolean,                                        \
+       (GVariant * value, const GVariantType* type))                          \
+  FUNC(g_variant_new_int32, GVariant*, (gint32 value))                        \
+  FUNC(g_variant_new_boolean, GVariant*, (gboolean value))                    \
+  FUNC(g_variant_new_string, GVariant*, (const char* string))                 \
+  FUNC(g_variant_unref, void, (GVariant * value))
+
+#define FUNC(name, type, params)      \
+  typedef type(*_##name##_fn) params; \
+  static _##name##_fn _##name;
+
+GSETTINGS_FUNCTIONS
+
+#undef FUNC
+
+#define g_settings_new _g_settings_new
+#define g_settings_list_schemas _g_settings_list_schemas
+#define g_settings_list_keys _g_settings_list_keys
+#define g_settings_get_value _g_settings_get_value
+#define g_settings_set_value _g_settings_set_value
+#define g_settings_range_check _g_settings_range_check
+#define g_variant_get_int32 _g_variant_get_int32
+#define g_variant_get_boolean _g_variant_get_boolean
+#define g_variant_get_string _g_variant_get_string
+#define g_variant_get_strv _g_variant_get_strv
+#define g_variant_is_of_type _g_variant_is_of_type
+#define g_variant_new_int32 _g_variant_new_int32
+#define g_variant_new_boolean _g_variant_new_boolean
+#define g_variant_new_string _g_variant_new_string
+#define g_variant_unref _g_variant_unref
+
+static PRLibrary* gioLib = nullptr;
+
+class nsGSettingsCollection final : public nsIGSettingsCollection {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIGSETTINGSCOLLECTION
+
+  explicit nsGSettingsCollection(GSettings* aSettings)
+      : mSettings(aSettings), mKeys(nullptr) {}
+
+ private:
+  ~nsGSettingsCollection();
+
+  bool KeyExists(const nsACString& aKey);
+  bool SetValue(const nsACString& aKey, GVariant* aValue);
+
+  GSettings* mSettings;
+  char** mKeys;
+};
+
+nsGSettingsCollection::~nsGSettingsCollection() {
+  g_strfreev(mKeys);
+  g_object_unref(mSettings);
+}
+
+bool nsGSettingsCollection::KeyExists(const nsACString& aKey) {
+  if (!mKeys) mKeys = g_settings_list_keys(mSettings);
+
+  for (uint32_t i = 0; mKeys[i] != nullptr; i++) {
+    if (aKey.Equals(mKeys[i])) return true;
+  }
+
+  return false;
+}
+
+bool nsGSettingsCollection::SetValue(const nsACString& aKey, GVariant* aValue) {
+  if (!KeyExists(aKey) ||
+      !g_settings_range_check(mSettings, PromiseFlatCString(aKey).get(),
+                              aValue)) {
+    g_variant_unref(aValue);
+    return false;
+  }
+
+  return g_settings_set_value(mSettings, PromiseFlatCString(aKey).get(),
+                              aValue);
+}
+
+NS_IMPL_ISUPPORTS(nsGSettingsCollection, nsIGSettingsCollection)
+
+NS_IMETHODIMP
+nsGSettingsCollection::SetString(const nsACString& aKey,
+                                 const nsACString& aValue) {
+  GVariant* value = g_variant_new_string(PromiseFlatCString(aValue).get());
+  if (!value) return NS_ERROR_OUT_OF_MEMORY;
+
+  bool res = SetValue(aKey, value);
+
+  return res ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsGSettingsCollection::SetBoolean(const nsACString& aKey, bool aValue) {
+  GVariant* value = g_variant_new_boolean(aValue);
+  if (!value) return NS_ERROR_OUT_OF_MEMORY;
+
+  bool res = SetValue(aKey, value);
+
+  return res ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsGSettingsCollection::SetInt(const nsACString& aKey, int32_t aValue) {
+  GVariant* value = g_variant_new_int32(aValue);
+  if (!value) return NS_ERROR_OUT_OF_MEMORY;
+
+  bool res = SetValue(aKey, value);
+
+  return res ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsGSettingsCollection::GetString(const nsACString& aKey, nsACString& aResult) {
+  if (!KeyExists(aKey)) return NS_ERROR_INVALID_ARG;
+
+  GVariant* value =
+      g_settings_get_value(mSettings, PromiseFlatCString(aKey).get());
+  if (!g_variant_is_of_type(value, G_VARIANT_TYPE_STRING) &&
+      !g_variant_is_of_type(value, G_VARIANT_TYPE_OBJECT_PATH) &&
+      !g_variant_is_of_type(value, G_VARIANT_TYPE_SIGNATURE)) {
+    g_variant_unref(value);
+    return NS_ERROR_FAILURE;
+  }
+
+  aResult.Assign(g_variant_get_string(value, nullptr));
+  g_variant_unref(value);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGSettingsCollection::GetBoolean(const nsACString& aKey, bool* aResult) {
+  NS_ENSURE_ARG_POINTER(aResult);
+
+  if (!KeyExists(aKey)) return NS_ERROR_INVALID_ARG;
+
+  GVariant* value =
+      g_settings_get_value(mSettings, PromiseFlatCString(aKey).get());
+  if (!g_variant_is_of_type(value, G_VARIANT_TYPE_BOOLEAN)) {
+    g_variant_unref(value);
+    return NS_ERROR_FAILURE;
+  }
+
+  gboolean res = g_variant_get_boolean(value);
+  *aResult = res ? true : false;
+  g_variant_unref(value);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGSettingsCollection::GetInt(const nsACString& aKey, int32_t* aResult) {
+  NS_ENSURE_ARG_POINTER(aResult);
+
+  if (!KeyExists(aKey)) return NS_ERROR_INVALID_ARG;
+
+  GVariant* value =
+      g_settings_get_value(mSettings, PromiseFlatCString(aKey).get());
+  if (!g_variant_is_of_type(value, G_VARIANT_TYPE_INT32)) {
+    g_variant_unref(value);
+    return NS_ERROR_FAILURE;
+  }
+
+  *aResult = g_variant_get_int32(value);
+  g_variant_unref(value);
+
+  return NS_OK;
+}
+
+// These types are local to nsGSettingsService::Init, but ISO C++98 doesn't
+// allow a template (ArrayLength) to be instantiated based on a local type.
+// Boo-urns!
+typedef void (*nsGSettingsFunc)();
+struct nsGSettingsDynamicFunction {
+  const char* functionName;
+  nsGSettingsFunc* function;
+};
+
+NS_IMETHODIMP
+nsGSettingsCollection::GetStringList(const nsACString& aKey,
+                                     nsIArray** aResult) {
+  if (!KeyExists(aKey)) return NS_ERROR_INVALID_ARG;
+
+  nsCOMPtr<nsIMutableArray> items(do_CreateInstance(NS_ARRAY_CONTRACTID));
+  if (!items) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  GVariant* value =
+      g_settings_get_value(mSettings, PromiseFlatCString(aKey).get());
+
+  if (!g_variant_is_of_type(value, G_VARIANT_TYPE_STRING_ARRAY)) {
+    g_variant_unref(value);
+    return NS_ERROR_FAILURE;
+  }
+
+  const gchar** gs_strings = g_variant_get_strv(value, nullptr);
+  if (!gs_strings) {
+    // empty array
+    items.forget(aResult);
+    g_variant_unref(value);
+    return NS_OK;
+  }
+
+  const gchar** p_gs_strings = gs_strings;
+  while (*p_gs_strings != nullptr) {
+    nsCOMPtr<nsISupportsCString> obj(
+        do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID));
+    if (obj) {
+      obj->SetData(nsDependentCString(*p_gs_strings));
+      items->AppendElement(obj);
+    }
+    p_gs_strings++;
+  }
+  g_free(gs_strings);
+  items.forget(aResult);
+  g_variant_unref(value);
+  return NS_OK;
+}
+
+nsresult nsGSettingsService::Init() {
+#define FUNC(name, type, params) {#name, (nsGSettingsFunc*)&_##name},
+  static const nsGSettingsDynamicFunction kGSettingsSymbols[] = {
+      GSETTINGS_FUNCTIONS};
+#undef FUNC
+
+  if (!gioLib) {
+    gioLib = PR_LoadLibrary("libgio-2.0.so.0");
+    if (!gioLib) return NS_ERROR_FAILURE;
+  }
+
+  for (auto GSettingsSymbol : kGSettingsSymbols) {
+    *GSettingsSymbol.function =
+        PR_FindFunctionSymbol(gioLib, GSettingsSymbol.functionName);
+    if (!*GSettingsSymbol.function) {
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(nsGSettingsService, nsIGSettingsService)
+
+nsGSettingsService::~nsGSettingsService() {
+  if (gioLib) {
+    PR_UnloadLibrary(gioLib);
+    gioLib = nullptr;
+  }
+}
+
+NS_IMETHODIMP
+nsGSettingsService::GetCollectionForSchema(
+    const nsACString& schema, nsIGSettingsCollection** collection) {
+  NS_ENSURE_ARG_POINTER(collection);
+
+  const char* const* schemas = g_settings_list_schemas();
+
+  for (uint32_t i = 0; schemas[i] != nullptr; i++) {
+    if (schema.Equals(schemas[i])) {
+      GSettings* settings = g_settings_new(PromiseFlatCString(schema).get());
+      nsGSettingsCollection* mozGSettings = new nsGSettingsCollection(settings);
+      NS_ADDREF(*collection = mozGSettings);
+      return NS_OK;
+    }
+  }
+
+  return NS_ERROR_FAILURE;
+}
diff --git a/toolkit/system/gnome/nsGSettingsService.h b/toolkit/system/gnome/nsGSettingsService.h
new file mode 100644
index 0000000000..1eb592e4aa
--- /dev/null
+++ b/toolkit/system/gnome/nsGSettingsService.h
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsGSettingsService_h_
+#define nsGSettingsService_h_
+
+#include "nsIGSettingsService.h"
+
+#define NS_GSETTINGSSERVICE_CID                      \
+  {                                                  \
+    0xbfd4a9d8, 0xd886, 0x4161, {                    \
+      0x81, 0xef, 0x88, 0x68, 0xda, 0x11, 0x41, 0x70 \
+    }                                                \
+  }
+
+class nsGSettingsService final : public nsIGSettingsService {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIGSETTINGSSERVICE
+
+  nsresult Init();
+
+ private:
+  ~nsGSettingsService();
+};
+
+#endif
diff --git a/toolkit/system/gnome/nsSystemAlertsService.cpp b/toolkit/system/gnome/nsSystemAlertsService.cpp
new file mode 100644
index 0000000000..870eb029f7
--- /dev/null
+++ b/toolkit/system/gnome/nsSystemAlertsService.cpp
@@ -0,0 +1,131 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode:nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsComponentManagerUtils.h"
+#include "nsSystemAlertsService.h"
+#include "nsAlertsIconListener.h"
+
+NS_IMPL_ADDREF(nsSystemAlertsService)
+NS_IMPL_RELEASE(nsSystemAlertsService)
+
+NS_INTERFACE_MAP_BEGIN(nsSystemAlertsService)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIAlertsService)
+  NS_INTERFACE_MAP_ENTRY(nsIAlertsService)
+  NS_INTERFACE_MAP_ENTRY(nsIAlertsDoNotDisturb)
+NS_INTERFACE_MAP_END
+
+nsSystemAlertsService::nsSystemAlertsService() = default;
+
+nsSystemAlertsService::~nsSystemAlertsService() = default;
+
+nsresult nsSystemAlertsService::Init() { return NS_OK; }
+
+NS_IMETHODIMP nsSystemAlertsService::ShowAlertNotification(
+    const nsAString& aImageUrl, const nsAString& aAlertTitle,
+    const nsAString& aAlertText, bool aAlertTextClickable,
+    const nsAString& aAlertCookie, nsIObserver* aAlertListener,
+    const nsAString& aAlertName, const nsAString& aBidi, const nsAString& aLang,
+    const nsAString& aData, nsIPrincipal* aPrincipal, bool aInPrivateBrowsing,
+    bool aRequireInteraction) {
+  nsCOMPtr<nsIAlertNotification> alert =
+      do_CreateInstance(ALERT_NOTIFICATION_CONTRACTID);
+  NS_ENSURE_TRUE(alert, NS_ERROR_FAILURE);
+  // vibrate is unused for now
+  nsTArray<uint32_t> vibrate;
+  nsresult rv = alert->Init(aAlertName, aImageUrl, aAlertTitle, aAlertText,
+                            aAlertTextClickable, aAlertCookie, aBidi, aLang,
+                            aData, aPrincipal, aInPrivateBrowsing,
+                            aRequireInteraction, false, vibrate);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return ShowAlert(alert, aAlertListener);
+}
+
+NS_IMETHODIMP nsSystemAlertsService::ShowPersistentNotification(
+    const nsAString& aPersistentData, nsIAlertNotification* aAlert,
+    nsIObserver* aAlertListener) {
+  return ShowAlert(aAlert, aAlertListener);
+}
+
+NS_IMETHODIMP nsSystemAlertsService::ShowAlert(nsIAlertNotification* aAlert,
+                                               nsIObserver* aAlertListener) {
+  NS_ENSURE_ARG(aAlert);
+
+  nsAutoString alertName;
+  nsresult rv = aAlert->GetName(alertName);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  RefPtr<nsAlertsIconListener> alertListener =
+      new nsAlertsIconListener(this, alertName);
+  if (!alertListener) return NS_ERROR_OUT_OF_MEMORY;
+
+  if (mSuppressForScreenSharing) {
+    alertListener->SendClosed();
+    return NS_OK;
+  }
+
+  AddListener(alertName, alertListener);
+  return alertListener->InitAlertAsync(aAlert, aAlertListener);
+}
+
+NS_IMETHODIMP nsSystemAlertsService::CloseAlert(const nsAString& aAlertName,
+                                                bool aContextClosed) {
+  RefPtr<nsAlertsIconListener> listener = mActiveListeners.Get(aAlertName);
+  if (!listener) {
+    return NS_OK;
+  }
+  mActiveListeners.Remove(aAlertName);
+  return listener->Close();
+}
+
+NS_IMETHODIMP nsSystemAlertsService::GetManualDoNotDisturb(bool* aRetVal) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsSystemAlertsService::SetManualDoNotDisturb(bool aDoNotDisturb) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsSystemAlertsService::GetSuppressForScreenSharing(
+    bool* aRetVal) {
+  NS_ENSURE_ARG(aRetVal);
+  *aRetVal = mSuppressForScreenSharing;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsSystemAlertsService::SetSuppressForScreenSharing(
+    bool aSuppress) {
+  mSuppressForScreenSharing = aSuppress;
+  return NS_OK;
+}
+
+bool nsSystemAlertsService::IsActiveListener(const nsAString& aAlertName,
+                                             nsAlertsIconListener* aListener) {
+  return mActiveListeners.Get(aAlertName) == aListener;
+}
+
+void nsSystemAlertsService::AddListener(const nsAString& aAlertName,
+                                        nsAlertsIconListener* aListener) {
+  const auto oldListener =
+      mActiveListeners.WithEntryHandle(aAlertName, [&](auto&& entry) {
+        RefPtr<nsAlertsIconListener> oldListener =
+            entry ? entry.Data() : nullptr;
+        entry.InsertOrUpdate(aListener);
+        return oldListener;
+      });
+  if (oldListener) {
+    // If an alert with this name already exists, close it.
+    oldListener->Close();
+  }
+}
+
+void nsSystemAlertsService::RemoveListener(const nsAString& aAlertName,
+                                           nsAlertsIconListener* aListener) {
+  auto entry = mActiveListeners.Lookup(aAlertName);
+  if (entry && entry.Data() == aListener) {
+    // The alert may have been replaced; only remove it from the active
+    // listeners map if it's the same.
+    entry.Remove();
+  }
+}
diff --git a/toolkit/system/gnome/nsSystemAlertsService.h b/toolkit/system/gnome/nsSystemAlertsService.h
new file mode 100644
index 0000000000..d24168e9af
--- /dev/null
+++ b/toolkit/system/gnome/nsSystemAlertsService.h
@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsSystemAlertsService_h__
+#define nsSystemAlertsService_h__
+
+#include "nsIAlertsService.h"
+#include "nsTHashMap.h"
+
+class nsAlertsIconListener;
+
+class nsSystemAlertsService : public nsIAlertsService,
+                              public nsIAlertsDoNotDisturb {
+ public:
+  NS_DECL_NSIALERTSSERVICE
+  NS_DECL_NSIALERTSDONOTDISTURB
+  NS_DECL_ISUPPORTS
+
+  nsSystemAlertsService();
+
+  nsresult Init();
+
+  bool IsActiveListener(const nsAString& aAlertName,
+                        nsAlertsIconListener* aListener);
+  void RemoveListener(const nsAString& aAlertName,
+                      nsAlertsIconListener* aListener);
+
+ protected:
+  virtual ~nsSystemAlertsService();
+
+  void AddListener(const nsAString& aAlertName,
+                   nsAlertsIconListener* aListener);
+
+  nsTHashMap<nsStringHashKey, nsAlertsIconListener*> mActiveListeners;
+
+ private:
+  bool mSuppressForScreenSharing = false;
+};
+
+#endif /* nsSystemAlertsService_h__ */