User:Tsch81/monobook.js

var addExtraButtons = function{ mw.toolbar.addButton( {       imageFile: '//upload.wikimedia.org/wikipedia/en/3/34/Button_hide_comment.png',        speedTip: 'Comment visible only for editors',        tagOpen: '',        sampleText: 'Insert comment here',        imageId: 'button-comment'    } ); }; if( $.inArray( mw.config.get( 'wgAction' ), [ 'edit', 'submit' ] ) !== -1 ) { mw.loader.using( 'user.options', function {        if ( ! mw.user.options.get( 'usebetatoolbar' ) ) {           mw.loader.using( 'mediawiki.action.edit', function{ $( addExtraButtons ); } );       }    } ); }