--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -15978,16 +15978,22 @@
 
 # Whether to use gtk titlebar actions for middle click instead of Firefox
 # build in one
 - name: widget.gtk.titlebar-action-middle-click-enabled
   type: bool
   value: false
   mirror: always
 
+# Whether to ignore middle click events on widget level.
+- name: widget.gtk.middle-click-enabled
+  type: bool
+  value: true
+  mirror: always
+
 # Whether we enable rounded bottom corners on GTK by default.
 #
 # The implementation is a bit hacky (see details in bug 1850827) so behind a
 # pref for emergency purposes.
 - name: widget.gtk.rounded-bottom-corners.enabled
   type: bool
   value: false
   mirror: always

--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -8212,16 +8212,20 @@ static gboolean motion_notify_event_cb(G
 
   return TRUE;
 }
 
 static gboolean button_press_event_cb(GtkWidget* widget,
                                       GdkEventButton* event) {
   UpdateLastInputEventTime(event);
 
+  if (event->button == 2 && !StaticPrefs::widget_gtk_middle_click_enabled()) {
+    return FALSE;
+  }
+
   RefPtr<nsWindow> window = GetFirstNSWindowForGDKWindow(event->window);
   if (!window) {
     return FALSE;
   }
 
   window->OnButtonPressEvent(event);
 
   if (GdkIsWaylandDisplay()) {
@@ -8230,16 +8234,20 @@ static gboolean button_press_event_cb(Gt
 
   return TRUE;
 }
 
 static gboolean button_release_event_cb(GtkWidget* widget,
                                         GdkEventButton* event) {
   UpdateLastInputEventTime(event);
 
+  if (event->button == 2 && !StaticPrefs::widget_gtk_middle_click_enabled()) {
+    return FALSE;
+  }
+
   RefPtr<nsWindow> window = GetFirstNSWindowForGDKWindow(event->window);
   if (!window) {
     return FALSE;
   }
 
   window->OnButtonReleaseEvent(event);
 
   return TRUE;