diff -u8pdNr 0.5/chrome/content/excasel-overlay.xul 0.5.1/chrome/content/excasel-overlay.xul
--- 0.5/chrome/content/excasel-overlay.xul	2019-08-09 20:54:01.530287200 +0200
+++ 0.5.1/chrome/content/excasel-overlay.xul	2019-10-02 20:14:45.782636500 +0200
@@ -1,13 +1,12 @@
 <?xml version="1.0"?>
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
 <?xml-stylesheet href="chrome://excasel/skin/excasel.css" type="text/css"?>
 <!DOCTYPE overlay SYSTEM "chrome://excasel/locale/excasel.dtd">
 
 <overlay id="excasel-overlay"
          xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
   <script type="application/javascript"
           src="chrome://excasel/content/excasel.js"/>
 
diff -u8pdNr 0.5/manifest.json 0.5.1/manifest.json
--- 0.5/manifest.json	2019-08-09 20:52:02.949799300 +0200
+++ 0.5.1/manifest.json	2019-10-02 20:14:27.917733400 +0200
@@ -4,17 +4,17 @@
     "gecko": {
       "id": "excasel@nadelundhirn.de",
       "strict_min_version": "68.0",
       "update_url": "https://www.nadelundhirn.de/krams/exten/exportcalendarselection/updates.json"
     }
   },
   "name": "__MSG_extensionName__",
   "description": "__MSG_extensionDescription__",
-  "version": "0.5",
+  "version": "0.5.1",
   "homepage_url": "https://www.nadelundhirn.de/wp/tag/export-calendar-selection/",
   "default_locale": "de",
   "icons": {
     "32": "chrome/skin/excasel32.png"
    },
   "legacy": {
     "type": "xul"
   }