onSecurityChange wbp.progressListener = { // implements nsIWebProgressListener onStateChange: function (aWebProgress, aRequest, aStateFlags, aStatus) { if (aStateFlags & Ci.nsIWebProgressListener.STATE_START) dump("started "); if (aStateFlags & Ci.nsIWebProgressListener.STATE_STOP) dump("stopped "); }, onProgressChange: function (aWebProgress, aRequest, aCurSelfProgress, aMaxSelfProgress, aCurTota