nsIWebProgressListener
ress, in nsirequest arequest, in long acurselfprogress, in long amaxselfprogress, in long acurtotalprogress, in long amaxtotalprogress); void onsecuritychange(in nsiwebprogress awebprogress, in nsirequest arequest, in unsigned long astate); void onstatechange(in nsiwebprogress awebprogress, in nsirequest arequest, in unsigned long astateflags, in nsresult astatus); void onstatuschange(in nsiwebprogress awebprogress, in nsirequest arequest, in nsresult astatus, in wstring amessage); constants state transition flags these flags indicate the various states that requests may transition through as they are being loaded.
... onstatuschange() notification that the status of a request has changed.
... void onstatuschange( in nsiwebprogress awebprogress, in nsirequest arequest, in nsresult astatus, in wstring amessage ); parameters awebprogress the nsiwebprogress instance that fired the notification.
... sendasyncmessage("myaddonmessage", { name: "onlocationchange", outerwindowid: outerwindowid, uri: auri.spec, charset: auri.charset, flag: aflag, }); }, // for definitions of the remaining functions see related documentation onprogresschange: function(awebprogress, arequest, curself, maxself, curtot, maxtot) {}, onstatuschange: function(awebprogress, arequest, astatus, amessage) {}, onsecuritychange: function(awebprogress, arequest, astate) {} } let filter = cc["@mozilla.org/appshell/component/browser-status-filter;1"] .createinstance(ci.nsiwebprogress); filter.addprogresslistener(mylistener, ci.nsiwebprogress.notify_all); let webprogress = docshell.queryinterface(ci.nsiinterfacerequestor) ...

nsIDownloadProgressListener
g long acurtotalprogress, in long long amaxtotalprogress, in nsidownload adownload); void onsecuritychange(in nsiwebprogress awebprogress, in nsirequest arequest, in unsigned long astate, in nsidownload adownload); void onstatechange(in nsiwebprogress awebprogress, in nsirequest arequest, in unsigned long astateflags, in nsresult astatus, in nsidownload adownload); void onstatuschange(in nsiwebprogress awebprogress, in nsirequest arequest, in nsresult astatus, in wstring amessage, in nsidownload adownload); obsolete since gecko 1.9.1 attributes attribute type description document nsidomdocument document the document of the download manager frontend.
... onstatuschange() obsolete since gecko 1.9.1 (firefox 3.5 / thunderbird 3.0 / seamonkey 2.0) called when the status of a download request has changed.
... void onstatuschange( in nsiwebprogress awebprogress, in nsirequest arequest, in nsresult astatus, in wstring amessage, in nsidownload adownload ); parameters awebprogress the nsiwebprogress instance used by the download manager to monitor downloads.

Progress Listeners - Archive of obsolete content
}, // for definitions of the remaining functions see related documentation onprogresschange: function(awebprogress, arequest, curself, maxself, curtot, maxtot) {}, onstatuschange: function(awebprogress, arequest, astatus, amessage) {}, onsecuritychange: function(awebprogress, arequest, astate) {} } attach the progress listener to a <browser> or a <tabbrowser> element using addprogresslistener, for example for firefox put the following code in a load listener of a main window: gbrowser.addprogresslistener(mylistener); when used with a browser, the second argume...
...i.spec); this.oldurl = auri.spec; }, // nsiwebprogresslistener queryinterface: xpcomutils.generateqi(["nsiwebprogresslistener", "nsisupportsweakreference"]), onlocationchange: function(aprogress, arequest, auri) { this.processnewurl(auri); }, onstatechange: function() {}, onprogresschange: function() {}, onstatuschange: function() {}, onsecuritychange: function() {} }; window.addeventlistener("load", function() { myextension.init() }, false); window.addeventlistener("unload", function() { myextension.uninit() }, false); note: if you use the same listener for more than one tab/window, use awebprogress.domwindow in the callback methods to obtain the tab/window which triggers the state change or event.

Listening to events on all tabs
onstatuschange notification that the status of a request has changed.
...void onstatuschange( nsidomxulelement abrowser, nsiwebprogress awebprogress, nsirequest arequest, nsresult astatus, prunichar *amessage ); parameters abrowser the browser that fired the notification.

nsIDocumentLoader
ces.nsidocumentloader); method overview void clearparentdocloader(); obsolete since gecko 1.8 void createdocumentloader(out nsidocumentloader aninstance); obsolete since gecko 1.8 void destroy(); obsolete since gecko 1.8 void fireonlocationchange(in nsiwebprogress awebprogress, in nsirequest arequest, in nsiuri auri); obsolete since gecko 1.8 void fireonstatuschange(in nsiwebprogress awebprogress, in nsirequest arequest, in nsresult astatus, in wstring amessage); obsolete since gecko 1.8 void getcontentviewercontainer(in nsisupports adocumentid, out nsicontentviewercontainer aresult); native code only!
... fireonlocationchange() obsolete since gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) void fireonlocationchange( in nsiwebprogress awebprogress, in nsirequest arequest, in nsiuri auri ); parameters awebprogress arequest auri fireonstatuschange() obsolete since gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) void fireonstatuschange( in nsiwebprogress awebprogress, in nsirequest arequest, in nsresult astatus, in wstring amessage ); parameters awebprogress arequest astatus amessage native code only!getcontentviewercontainer obsolete since gecko 1.8 (firefox 1.

XUL Questions and Answers - Archive of obsolete content
s when a load finishes } } } return 0; } // this fires when the location bar changes i.e load event is confirmed // or when the user switches tabs listobj.onlocationchange = function(aprogress, arequest, auri) { // do whatever you want to do return 0; } // for definitions of the remaining functions see xulplanet.com listobj.onprogresschange = function() { return 0 }; listobj.onstatuschange = function() { return 0 }; listobj.onsecuritychange = function() { return 0 }; listobj.onlinkiconavailable = function() { return 0 }; /* i use the progress listener to trap the end of a local html "template" file loading, and run xslt transormations.

nsIWebProgress
notify_status 0x00000020 receive nsiwebprogresslistener.onstatuschange() events.