Bookmarklet for Sharing on Facebook (I guess that one is FF specific):

  javascript:var%20d=document,f='http://www.facebook.com/share,l=d.location,e=encodeURIComponent,p=.php?src=bm&v=4&i=1255717032&u=+e(l.href)+&t=+e(d.title);1;try{if%20(!/^(.*\.)?facebook\.[^.]*$/.test(l.host))throw(0);share_internal_bookmarklet(p)}catch(z)%20{a=function()%20{if%20(!window.open(f+'r'+p,'sharer','toolbar=0,status=0,resizable=1,width=626,height=436'))l.href=f+p};if%20(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else{a()}}void(0)