User:Enterprisey/disable-save-on-click.js

Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
// This is a userscript to disable the "Publish changes" button after you click it,
// so that you don't edit-conflict with yourself.
$( function() {
    if( document.getElementById("editform") ) {

        // We're on an edit page
        document.getElementById( "wpSave" ).addEventListener( "click", function () {
            this.disabled = true;
        } );
    }
} );