diff --git a/bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.js b/bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.js
index 88a42dbdcccc738ec30bd8600dc329a9be5f0633..0826531b30352e99f96124bf5ec10287b5f1d858 100644
--- a/bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.js
+++ b/bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.js
@@ -11,7 +11,11 @@
       setting_id: "setting/" + document.head.querySelector(
         'script[data-renderjs-configuration="application_title"]'
       ).textContent
-    });
+    }),
+    index,
+    styleSheet,
+    wallpaper_url,
+    a_element;
 
   function renderMainGadget(gadget, url, options) {
     var page_gadget;
@@ -825,5 +829,27 @@
       return displayError(this, new Error("Unexpected form submit"));
     });
 
+  //
+  // For Firefox, Wallpaper URL must be absolute one.
+  //
+  if (navigator.userAgent.toLowerCase().indexOf('firefox') > -1) {
+    for (index = 0; index < document.styleSheets.length; index += 1) {
+      styleSheet = document.styleSheets[index];
+      if (styleSheet.href.startsWith('data:text/css;')) {
+        wallpaper_url = styleSheet.cssRules[0].style
+          .backgroundImage.slice(4, -1).replace(/["']/g, '');
+        a_element = document.createElement('a');
+        a_element.href = wallpaper_url;
+        styleSheet.cssRules[0].style.backgroundImage =
+          'url("' + a_element.href + '")';
+        break;
+      }
+    }
+    index = null;
+    styleSheet = null;
+    wallpaper_url = null;
+    a_element = null;
+  }
+
 }(window, document, RSVP, rJS,
   XMLHttpRequest, location, console, navigator, Event));
\ No newline at end of file
diff --git a/bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.xml b/bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.xml
index 5159212f3cf5e0914e66dafa75f9ddf71904e342..638d882a5d4334d5cd768ba23666b7a15e4b5755 100644
--- a/bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.xml
+++ b/bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.xml
@@ -228,7 +228,7 @@
             </item>
             <item>
                 <key> <string>serial</string> </key>
-                <value> <string>975.29292.10042.3754</string> </value>
+                <value> <string>978.15396.60577.50107</string> </value>
             </item>
             <item>
                 <key> <string>state</string> </key>
@@ -246,7 +246,7 @@
                     </tuple>
                     <state>
                       <tuple>
-                        <float>1556870187.8</float>
+                        <float>1567690058.72</float>
                         <string>UTC</string>
                       </tuple>
                     </state>