diff --git a/sirius_cli/src/main/resources/sirius_frontend.build.properties b/sirius_cli/src/main/resources/sirius_frontend.build.properties
index 01432dac25..2ce7fd932b 100644
--- a/sirius_cli/src/main/resources/sirius_frontend.build.properties
+++ b/sirius_cli/src/main/resources/sirius_frontend.build.properties
@@ -1,5 +1,5 @@
 #here you can provide properties that may be needed during build- AND during runtime and should not be editable by the user at runtime
-de.unijena.bioinf.siriusFrontend.version=5.7.3-SNAPSHOT
+de.unijena.bioinf.siriusFrontend.version=5.7.3
 de.unijena.bioinf.sirius.version=4.12.14
 de.unijena.bioinf.fingerid.version=2.6.14
 #
@@ -28,6 +28,7 @@ de.unijena.bioinf.utils.errorReport.softwareName=SIRIUS
 de.unijena.bioinf.sirius.description=SIRIUS is a java-based software framework for discovering a landscape of de-novo identification of metabolites using single and tandem mass spectrometry. SIRIUS uses isotope pattern analysis for detecting the molecular formula and further analyses the fragmentation pattern of a compound using fragmentation trees. Fragmentation trees can be uploaded to CSI:FingerID via a web service, and results can be displayed in the SIRIUS graphical user interface.
 de.unijena.bioinf.sirius.download=https://bio.informatik.uni-jena.de/software/sirius/
 de.unijena.bioinf.sirius.ws.default.name=.sirius
+de.unijena.bioinf.sirius.docu.url=https://boecker-lab.github.io/docs.sirius.github.io/
 de.unijena.bioinf.fingerid.usedWorkers=FINGER_ID,CANOPUS,COVTREE
 #### BEGIN Websevice Defaults - Might be changed for different hosting
 ## This is just for the connections check
diff --git a/sirius_gui/src/main/java/de/unijena/bioinf/ms/gui/actions/AbstractUserPortalAction.java b/sirius_gui/src/main/java/de/unijena/bioinf/ms/gui/actions/AbstractUserPortalAction.java
index bc96b7bfc4..74471f3b50 100644
--- a/sirius_gui/src/main/java/de/unijena/bioinf/ms/gui/actions/AbstractUserPortalAction.java
+++ b/sirius_gui/src/main/java/de/unijena/bioinf/ms/gui/actions/AbstractUserPortalAction.java
@@ -26,6 +26,7 @@
 
 import javax.swing.*;
 import java.awt.event.ActionEvent;
+import java.io.IOException;
 import java.net.URI;
 
 import static de.unijena.bioinf.ms.gui.mainframe.MainFrame.MF;
@@ -50,8 +51,13 @@ public synchronized void actionPerformed(ActionEvent e) {
         try {
             GuiUtils.openURL(path(), "Open User Portal", true);
         } catch (Exception ex2) {
-            LoggerFactory.getLogger(getClass()).error("Could not Open User Portal in System Browser", ex2);
-            new ExceptionDialog(MF, "Could not Open User Portal in System Browser: " + ex2.getMessage());
+            LoggerFactory.getLogger(getClass()).error("Could not Open 'User Portal' in system browser, Try internal browser as fallback.", ex2);
+            try {
+                GuiUtils.openURL(path(), "Open User Portal (internal)", false);
+            } catch (IOException ex) {
+                LoggerFactory.getLogger(getClass()).error("Could neither open 'User Portal' in system browser nor in internal Browser." +   System.lineSeparator() + "Please copy the url to your browser: " + path(), ex2);
+                new ExceptionDialog(MF, "Could neither open 'User Portal' in system browser nor in internal Browser: " + ex2.getMessage() + System.lineSeparator() + "Please copy the url to your browser: " + path());
+            }
         }
     }
 
diff --git a/sirius_gui/src/main/java/de/unijena/bioinf/ms/gui/actions/OpenOnlineDocumentationAction.java b/sirius_gui/src/main/java/de/unijena/bioinf/ms/gui/actions/OpenOnlineDocumentationAction.java
index 1066d8f289..48dc1f9e84 100644
--- a/sirius_gui/src/main/java/de/unijena/bioinf/ms/gui/actions/OpenOnlineDocumentationAction.java
+++ b/sirius_gui/src/main/java/de/unijena/bioinf/ms/gui/actions/OpenOnlineDocumentationAction.java
@@ -20,6 +20,9 @@
 package de.unijena.bioinf.ms.gui.actions;
 
 import de.unijena.bioinf.ms.gui.configs.Icons;
+import de.unijena.bioinf.ms.gui.dialogs.ExceptionDialog;
+import de.unijena.bioinf.ms.gui.utils.GuiUtils;
+import de.unijena.bioinf.ms.properties.PropertyManager;
 import org.slf4j.LoggerFactory;
 
 import javax.swing.*;
@@ -29,8 +32,9 @@
 import java.net.URI;
 import java.net.URISyntaxException;
 
-public class OpenOnlineDocumentationAction extends AbstractAction {
+import static de.unijena.bioinf.ms.gui.mainframe.MainFrame.MF;
 
+public class OpenOnlineDocumentationAction extends AbstractAction {
     public OpenOnlineDocumentationAction() {
         super("Help");
         putValue(Action.LARGE_ICON_KEY, Icons.HELP_32);
@@ -39,10 +43,23 @@ public OpenOnlineDocumentationAction() {
 
     @Override
     public void actionPerformed(ActionEvent e) {
+        String url = PropertyManager.getProperty("de.unijena.bioinf.sirius.docu.url");
         try {
-            Desktop.getDesktop().browse(new URI("https://boecker-lab.github.io/docs.sirius.github.io/"));
-        } catch (IOException | URISyntaxException er) {
-            LoggerFactory.getLogger(this.getClass()).error(er.getMessage(), er);
+            URI uri = new URI(url);
+            try {
+                GuiUtils.openURL(uri, "Open Online Documentation", true);
+            } catch (IOException er) {
+                LoggerFactory.getLogger(getClass()).error("Could not 'Online Documentation' in system browser, Try internal browser as fallback.", er);
+                try {
+                    GuiUtils.openURL(uri, "Open Online Documentation (internal)", false);
+                } catch (IOException ex2) {
+                    LoggerFactory.getLogger(getClass()).error("Could neither open 'Online Documentation' in system browser nor in internal Browser." +   System.lineSeparator() + "Please copy the url to your browser: " + uri, ex2);
+                    new ExceptionDialog(MF, "Could neither open 'Online Documentation' in system browser nor in SIRIUS' internal browser: " + ex2.getMessage() + System.lineSeparator() + "Please copy the url to your browser: " + uri);
+                }
+                LoggerFactory.getLogger(this.getClass()).error(er.getMessage(), er);
+            }
+        } catch (URISyntaxException ex) {
+            new ExceptionDialog(MF,"Malformed URL '" + url + "'. Cause: " + ex.getMessage());
         }
     }
 }