Mutation Summary gets clogged

[blpraveen]

I have been using mutation summary with one of the firefox addon I have developed.
I used it observer anchors with mailto link. It was all working fine.
Recently our colleque reported its system gets clogged when pages loads.
Myself looked at the page I see a very large data being loaded via ajax and firefox memory get exhaust. Suddenly the page gets hanged and after sometime popup error shows that it stopped while executing the mutation summary.
Please Advise

[blpraveen]

Here is my function

addEventToMailToLink : function(e){     

  if ( myfunction.getBoolPref('disablemyaddon', false) )
      return;

  try{


    var doc = e.originalTarget;
    var obs = new MutationSummary({
             rootNode: doc,
            callback: myfunction.addEventToMutationMarkup,
            queries: [{ element: "a[href]"}] //element: "a[href^='mailto:']"
            });     
      var links = doc.getElementsByTagName('a');
      if ( !links || links.length == 0 )
          return;
      for(var i =0; i < links.length; i++){
          var link = links[i];
          if ( link.protocol && link.protocol == "mailto:"  ){
              link.setAttribute("onclick", "return false;");
              link.addEventListener("click",myfunction.mailtoLinkClick,true);
          }
      }
  }catch( e ){ alert(e.message);} 
 },

How can I improve it to avoid clog