Index: wp-includes/link-template.php
===================================================================
--- wp-includes/link-template.php	(revision 17572)
+++ wp-includes/link-template.php	(working copy)
@@ -1906,7 +1906,7 @@
 			f='" . admin_url('press-this.php') . "',
 			l=d.location,
 			e=encodeURIComponent,
-			u=f+'?u='+e(l.href)+'&t='+e(d.title)+'&s='+e(s)+'&v=4';
+			u=f+'?u='+e(l.href.replace(/\//g,'\\/'))+'&t='+e(d.title)+'&s='+e(s)+'&v=4';
 			a=function(){if(!w.open(u,'t','toolbar=0,resizable=1,scrollbars=1,status=1,width=720,height=570'))l.href=u;};
 			if (/Firefox/.test(navigator.userAgent)) setTimeout(a, 0); else a();
 			void(0)";