I promised I’d post my solution, and here it is… replace your bookmark javascript with this:
javascript:if(navigator.userAgent.indexOf('Safari') >=0){Q=getSelection();}else{Q=document.selection?document.selection.createRange().text:document.getSelection();}void(window.open('https://news.h2only.ca/wp-admin/post.php?text='+encodeURIComponent(Q)+'&popupurl='+encodeURIComponent(location.href)+'&popuptitle='+encodeURIComponent(document.title),'WordPressbookmarklet','scrollbars=yes,width=1000,height=700,left=25,top=25,status=yes'));