--- a/dom/base/nsGlobalWindowOuter.cpp
+++ b/dom/base/nsGlobalWindowOuter.cpp
@@ -5693,17 +5693,17 @@ PopupBlocker::PopupControlState nsGlobal
       break;
     default:
       NS_WARNING("Strange PopupControlState!");
   }
 
   // limit the number of simultaneously open popups
   if (abuse == PopupBlocker::openAbused || abuse == PopupBlocker::openBlocked ||
       abuse == PopupBlocker::openControlled) {
-    int32_t popupMax = Preferences::GetInt("dom.popup_maximum", -1);
+    int32_t popupMax = StaticPrefs::dom_popup_maximum();
     if (popupMax >= 0 && gOpenPopupSpamCount >= popupMax)
       abuse = PopupBlocker::openOverridden;
   }
 
   // If this popup is allowed, let's block any other for this event, forcing
   // PopupBlocker::openBlocked state.
   if ((abuse == PopupBlocker::openAllowed ||
        abuse == PopupBlocker::openControlled) &&

--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -1308,16 +1308,23 @@
   mirror: always
 
 # Block multiple window.open() per single event.
 - name: dom.block_multiple_popups
   type: bool
   value: true
   mirror: always
 
+# The maximum number of popup that is allowed to be opened. Set to -1 for no
+# limit.
+- name: dom.popup_maximum
+  type: int32_t
+  value: 20
+  mirror: always
+
 # Whether window.location.reload() and window.history.go(0) should be blocked
 # if called directly from a window resize event handler.
 #
 # This used to be necessary long ago to prevent terrible UX when using stuff
 # like TypeAheadFind (bug 258917), but it also causes compat issues on mobile
 # (bug 1570566).
 #
 # So for now disable it on Android and Desktop Nightly, to see if we have any

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -950,17 +950,16 @@ pref("dom.disable_window_open_feature.me
 pref("dom.disable_window_open_feature.resizable",   true);
 pref("dom.disable_window_open_feature.minimizable", false);
 pref("dom.disable_window_open_feature.status",      true);
 
 pref("dom.allow_scripts_to_close_windows",          false);
 
 pref("dom.require_user_interaction_for_beforeunload", true);
 
-pref("dom.popup_maximum",                           20);
 pref("dom.popup_allowed_events", "change click dblclick auxclick mouseup pointerup notificationclick reset submit touchend contextmenu");
 
 pref("dom.serviceWorkers.disable_open_click_delay", 1000);
 
 pref("dom.storage.enabled", true);
 // Whether or not LSNG (Next Generation Local Storage) is enabled.
 // See bug 1517090 for enabling this on Nightly.
 // See bug 1534736 for changing it to EARLY_BETA_OR_EARLIER.