Purpose

To have the 'Watch this page' check box unchecked by default when editing a page.

Solution

1. Navigate to Custom HTML in Confluence Admin (can be found in Browse >> Confluence Admin >> Custom HTML)
2. Click Edit button

3. On At end of the HEAD field, put the following javascript snippet

   <script type="text/javascript">
   AJS.bind('init.rte', function() {
     AJS.$('#watchPage').attr('checked', false);
   });
   </script>
   

4. Click Save, and notice it will be unchecked by default