diff --git a/api/js/jsapi/egw_global.d.ts b/api/js/jsapi/egw_global.d.ts
index f1f7a7848c..29a5bb2d00 100644
--- a/api/js/jsapi/egw_global.d.ts
+++ b/api/js/jsapi/egw_global.d.ts
@@ -1120,8 +1120,9 @@ declare interface IegwWndLocal extends IegwGlobal
 	 * @param {object} _content content to be passed to method
 	 * @param {string|object} _extra url or object of extra
 	 * @param {regexp} _regexp regular expression to get specific popup with matched url
+	 * @param {boolean} _check_popup_blocker TRUE check if browser pop-up blocker is on/off, FALSE no check
 	 */
-	openWithinWindow(_app : string, _method : string, _content : object, _extra? : string|object, _regexp? : RegExp) : void;
+	openWithinWindow(_app : string, _method : string, _content : object, _extra? : string|object, _regexp? : RegExp, _check_popup_blocker? : boolean) : void;
 
 	/**
 	 * implemented in egw_ready.js
diff --git a/api/js/jsapi/egw_open.js b/api/js/jsapi/egw_open.js
index 0dd044f30a..31de272fca 100644
--- a/api/js/jsapi/egw_open.js
+++ b/api/js/jsapi/egw_open.js
@@ -514,8 +514,9 @@ egw.extend('open', egw.MODULE_WND_LOCAL, function(_egw, _wnd)
 		 * @param {object} _content content to be passed to method
 		 * @param {string|object} _extra url or object of extra
 		 * @param {regex} _regexp regular expression to get specific popup with matched url
+		 * @param {boolean} _check_popup_blocker TRUE check if browser pop-up blocker is on/off, FALSE no check
 		 */
-		openWithinWindow: function (_app, _method, _content, _extra, _regexp)
+		openWithinWindow: function (_app, _method, _content, _extra, _regexp, _check_popup_blocker)
 		{
 			var popups = window.framework.popups_get(_app, _regexp);
 
@@ -554,7 +555,7 @@ egw.extend('open', egw.MODULE_WND_LOCAL, function(_egw, _wnd)
 				// Firefox:~ 65k, Safari:80k, Chrome: 2MB, Apache: 4k, Nginx: 4k
 				if (len > 2083)
 				{
-					var popup = egw.open('','mail','add','','compose__','mail');
+					var popup = egw.open('','mail','add','','compose__','mail', _check_popup_blocker);
 					var $tmpForm = jQuery(document.createElement('form'));
 					var $tmpSubmitInput = jQuery(document.createElement('input')).attr({type:"submit"});
 					for (var i in _extra)
@@ -578,7 +579,7 @@ egw.extend('open', egw.MODULE_WND_LOCAL, function(_egw, _wnd)
 				}
 				else
 				{
-					egw.open('', _app, 'add', _extra, _app, _app);
+					egw.open('', _app, 'add', _extra, _app, _app, _check_popup_blocker);
 				}
 			};
 			for(var i = 0; i < popups.length; i++)
diff --git a/filemanager/js/app.js b/filemanager/js/app.js
index e3f1b94478..15d8f99664 100644
--- a/filemanager/js/app.js
+++ b/filemanager/js/app.js
@@ -229,7 +229,7 @@ var filemanagerAPP = /** @class */ (function (_super) {
         content.data.files["filemode"] = params['preset[filemode]'];
         // always open compose in html mode, as attachment links look a lot nicer in html
         params["mimeType"] = 'html';
-        return egw.openWithinWindow("mail", "setCompose", content, params, /mail.mail_compose.compose/);
+        return egw.openWithinWindow("mail", "setCompose", content, params, /mail.mail_compose.compose/, true);
     };
     /**
      * Mail files action: open compose with already attached files
diff --git a/filemanager/js/app.ts b/filemanager/js/app.ts
index 9410f07761..b52707f95e 100644
--- a/filemanager/js/app.ts
+++ b/filemanager/js/app.ts
@@ -259,7 +259,7 @@ export class filemanagerAPP extends EgwApp
 		content.data.files["filemode"] = params['preset[filemode]'];
 		// always open compose in html mode, as attachment links look a lot nicer in html
 		params["mimeType"] = 'html';
-		return egw.openWithinWindow("mail", "setCompose", content, params, /mail.mail_compose.compose/);
+		return egw.openWithinWindow("mail", "setCompose", content, params, /mail.mail_compose.compose/, true);
 	}
 
 	/**