https://sourceforge.net/tracker/index.php?func=detail&aid=2851963&group_id=176962&atid=955896#

- alert user if browser is not supported.

zkwebui/WEB-INF/src/org/adempiere/webui/WLogin.java

@@ -14,14 +14,17 @@
 
 package org.adempiere.webui;
 
+import org.adempiere.webui.apps.AEnv;
 import org.adempiere.webui.part.AbstractUIPart;
 import org.adempiere.webui.theme.ITheme;
 import org.adempiere.webui.theme.ThemeManager;
 import org.adempiere.webui.window.LoginWindow;
+import org.zkoss.zk.au.out.AuScript;
 import org.zkoss.zk.ui.Component;
 import org.zkoss.zk.ui.Executions;
 import org.zkoss.zk.ui.UiException;
 import org.zkoss.zk.ui.metainfo.PageDefinition;
+import org.zkoss.zk.ui.util.Clients;
 import org.zkoss.zkex.zul.Borderlayout;
 import org.zkoss.zkex.zul.Center;
 import org.zkoss.zkex.zul.East;
@@ -75,6 +78,15 @@ public class WLogin extends AbstractUIPart
         LoginWindow loginWindow = new LoginWindow(app);
         loginWindow.setParent(vb);
 
+        if (!AEnv.isBrowserSupported())
+        {
+        	//TODO: localization
+        	String msg = "You might experience slow performance and user interface anomalies using your current browser to access the application. We recommend the use of Firefox, Google Chrome or Apple Safari to access the application.";
+        	String script = "alert('" + msg + "')";
+        	AuScript aus = new AuScript(null, script);
+        	Clients.response(aus);
+        }
+        
         try {
         	String right = ThemeManager.getLoginRightPanel();
 	        PageDefinition pageDefintion = Executions.getCurrent().getPageDefinition(right);

zkwebui/WEB-INF/src/org/adempiere/webui/apps/AEnv.java

@@ -561,6 +561,29 @@ public final class AEnv
     		return false;
     	}
     }
+    
+    /**
+     * @return boolean
+     */
+    public static boolean isBrowserSupported() {
+    	Execution execution = Executions.getCurrent();
+    	if (execution == null)
+    		return false;
+
+    	Object n = execution.getNativeRequest();
+    	boolean supported = false;
+    	if (n instanceof ServletRequest) {
+    		String userAgent = Servlets.getUserAgent((ServletRequest) n);
+    		if (userAgent.indexOf("Firefox") >= 0) {
+    			supported = true;
+    		} else if (userAgent.indexOf("AppleWebKit") >= 0) {
+    			if (userAgent.indexOf("Chrome") >= 0 || userAgent.indexOf("Safari") >= 0) {
+    				supported = true;
+    			} 
+    		} 
+    	} 
+    	return supported;
+    }
 
     /**
      *