Bug 1832627 - Popup should be closed. r=edgar, a=RyanVM

browser/base/content/browser-fullScreenAndPointerLock.js

@@ -255,6 +255,9 @@ var PointerlockFsWarning = {
         if (this._state == "hiding") {
           this._element.hidden = true;
         }
+        if (this._state == "onscreen") {
+          window.dispatchEvent(new CustomEvent("FullscreenWarningOnScreen"));
+        }
         break;
       }
       case "activate": {

toolkit/actors/SelectParent.sys.mjs

@@ -385,6 +385,7 @@ export var SelectParentHelper = {
         break;
 
       case "fullscreen":
+      case "FullscreenWarningOnScreen":
         if (this._currentMenulist) {
           this._currentMenulist.menupopup.hidePopup();
         }
@@ -444,6 +445,7 @@ export var SelectParentHelper = {
     popup.ownerGlobal.addEventListener("mouseup", this, true);
     popup.ownerGlobal.addEventListener("keydown", this, true);
     popup.ownerGlobal.addEventListener("fullscreen", this, true);
+    popup.ownerGlobal.addEventListener("FullscreenWarningOnScreen", this, true);
   },
 
   _unregisterListeners(popup) {
@@ -454,6 +456,11 @@ export var SelectParentHelper = {
     popup.ownerGlobal.removeEventListener("mouseup", this, true);
     popup.ownerGlobal.removeEventListener("keydown", this, true);
     popup.ownerGlobal.removeEventListener("fullscreen", this, true);
+    popup.ownerGlobal.removeEventListener(
+      "FullscreenWarningOnScreen",
+      this,
+      true
+    );
   },
 
   /**