rem: var channel = aRequest.QueryInterface(nsIChannel); dump("*****          request: " + channel.URI.spec + "\n"); 
add: try { var channel = aRequest.QueryInterface(nsIChannel); dump("*****          request: " + channel.URI.spec + "\n"); } catch(e) {} 
context:   onLocationChange : function(aWebProgress, aRequest, aLocation)  {    if (gShowDebugOutputLocationChange)    {      dump("***** onLocationChange: "+aLocation.spec+"\n");      var channel = aRequest.QueryInterface(nsIChannel);      dump("*****          request: " + channel.URI.spec + "\n");    }  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/d56262a401c9d60bbef8fdbf3317ef55705279f1/ComposerCommands.js/clean/editor/ui/composer/content/ComposerCommands.js