I can't say what is the problem, I've setted action on middle mouse button
click to open on new window and when I click on bookmarklets more info I
get another window and a prompt dialog. From now I can try anything : fill
it, press ok, cancel or close it the browser block at all.
This is session_crashed.xml:

<?xml version="2.0"?>
<session>
  <window x="0" y="0" width="1012" height="715">
    <embed url="javascript:if(frames.length&gt;0){F=' (Open frame in new
window
first.)'}else{F=''}Q=document.getSelection();if(!Q){void(Q=prompt('No text
selected on
page.'+F+'\n\nKeywords...?',''))};if(Q)location.href='http://bookmarklets.com/moreinfo.phtml?q='+escape(Q)"
title="Senza titolo"/>
  </window>
  <window x="0" y="0" width="1012" height="715">
    <embed url="http://localhost/" title="Home Page of Colossus (Daniele's
site)"/>
  </window>
</session>

Trying to resume from it cause to lock the browser again