fixed minor spelling mistake in website

Website/pages/help.vue

@@ -89,7 +89,7 @@
           <li>
             Take screenshot of extensions page of your browser with extension
             installed. <br />
-            To see extensions put this into adress bar:
+            To see extensions put this into address bar:
             <br />
             <code>about:addons</code> for Firefox
             <br />