rem: { 
add: { try { var mapiRegistry = Components.classes[ "@mozilla.org/mapiregistry;1" ]. getService( Components.interfaces.nsIMapiRegistry ); } catch(ex){ mapiRegistry = null; } 
context: function onOK(){     if (mapiRegistry) {         if (document.getElementById("mailnewsEnableMapi").checked)            mapiRegistry.setDefaultMailClient();        else            mapiRegistry.unsetDefaultMailClient();    }  }
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