diff --git a/extensions/inspector/resources/content/Flasher.js b/extensions/inspector/resources/content/Flasher.js
index 32278992045..43dacec5a44 100644
--- a/extensions/inspector/resources/content/Flasher.js
+++ b/extensions/inspector/resources/content/Flasher.js
@@ -89,7 +89,7 @@ Flasher.prototype =
   get element() { return this.mElement; },
   set element(val) 
   { 
-    if (val && val.nodeType == 1) {
+    if (val && val.nodeType == Node.ELEMENT_NODE) {
       this.mElement = val; 
       if ("scrollIntoView" in val) {
         val.scrollIntoView(false);
diff --git a/extensions/inspector/resources/content/browserOverlay.xul b/extensions/inspector/resources/content/browserOverlay.xul
index ca14ad2de6d..4ce6a9aa59e 100644
--- a/extensions/inspector/resources/content/browserOverlay.xul
+++ b/extensions/inspector/resources/content/browserOverlay.xul
@@ -41,7 +41,7 @@
   function inspectorGetContextNode()
   {
     var n = document.popupNode;
-    while (n && n.nodeType != 1)
+    while (n && n.nodeType != Node.ELEMENT_NODE)
       n = n.parentNode;
   
     return n;
diff --git a/extensions/inspector/resources/content/inspector.js b/extensions/inspector/resources/content/inspector.js
index e1c9f75d905..8b7ac1899ee 100644
--- a/extensions/inspector/resources/content/inspector.js
+++ b/extensions/inspector/resources/content/inspector.js
@@ -124,9 +124,9 @@ InspectorApp.prototype =
     this.mObjectPanel = this.mPanelSet.getPanel(1);
 
     if (this.mInitTarget) {
-      if (this.mInitTarget.nodeType == 9)
+      if (this.mInitTarget.nodeType == Node.DOCUMENT_NODE)
         this.setTargetDocument(this.mInitTarget);
-      else if (this.mInitTarget.nodeType == 1) {
+      else if (this.mInitTarget.nodeType == Node.ELEMENT_NODE) {
         this.setTargetDocument(this.mInitTarget.ownerDocument);
         this.mDocPanel.params = this.mInitTarget;
       }
diff --git a/extensions/inspector/resources/content/res/viewer-registry.rdf b/extensions/inspector/resources/content/res/viewer-registry.rdf
index 206fb5dcd0c..9b1be880c45 100644
--- a/extensions/inspector/resources/content/res/viewer-registry.rdf
+++ b/extensions/inspector/resources/content/res/viewer-registry.rdf
@@ -20,7 +20,7 @@
     <rdf:li><rdf:Description 
       ins:uid="domNode"
       ins:description="DOM Node"
-      ins:filter="return doesQI(object, 'nsIDOMNode') &amp;&amp; object.nodeType != 9;"/>
+      ins:filter="return doesQI(object, 'nsIDOMNode') &amp;&amp; object.nodeType != Node.DOCUMENT_NODE;"/>
     </rdf:li>
 
     <rdf:li><rdf:Description 
diff --git a/extensions/inspector/resources/content/search/inSearchModule.js b/extensions/inspector/resources/content/search/inSearchModule.js
index b3daafd652a..997c4f10ac1 100644
--- a/extensions/inspector/resources/content/search/inSearchModule.js
+++ b/extensions/inspector/resources/content/search/inSearchModule.js
@@ -170,7 +170,7 @@ inSearchModule.prototype =
       var col, data;
       for (var i= 0; i < kids.length; ++i) {
         col = kids[i];
-        if (col.nodeType == 1) { // ignore non-element nodes
+        if (col.nodeType == Node.ELEMENT_NODE) { // ignore non-element nodes
           data = { 
             name: col.getAttribute("name"), 
             title: col.getAttribute("title"), 
@@ -427,7 +427,7 @@ inSearchModule.prototype =
 
   installSearchReference: function(aItem)
   {
-    if (aItem.nodeType == 1) {
+    if (aItem.nodeType == Node.ELEMENT_NODE) {
       if (aItem.localName == "menuitem") {
         aItem.search = this.mImpl;
         for (var i = 0; i < aItem.childNodes.length; ++i)
diff --git a/extensions/inspector/resources/content/viewers/dom/dom.js b/extensions/inspector/resources/content/viewers/dom/dom.js
index 3fd0313b7b8..4898558993a 100644
--- a/extensions/inspector/resources/content/viewers/dom/dom.js
+++ b/extensions/inspector/resources/content/viewers/dom/dom.js
@@ -348,7 +348,7 @@ DOMViewer.prototype =
       indent += "  ";
     var line = indent;        
       
-    if (aNode.nodeType == 1) {
+    if (aNode.nodeType == Node.ELEMENT_NODE) {
       line += "<" + aNode.localName;
 
       var attrIndent = "";
@@ -375,9 +375,9 @@ DOMViewer.prototype =
           s += this._toXML(aNode.childNodes[i], aLevel+1);
         s += indent + "</" + aNode.localName + ">\n";
       }
-    } else if (aNode.nodeType == 3) {
+    } else if (aNode.nodeType == Node.TEXT_NODE) {
       s += aNode.nodeValue;
-    } else if (aNode.nodeType == 8) {
+    } else if (aNode.nodeType == Node.COMMENT_NODE) {
       s += line + "<!--" + aNode.nodeValue + "-->\n";
     }
     
@@ -655,7 +655,8 @@ DOMViewer.prototype =
   {
     // make sure we only try to flash element nodes, and don't 
     // flash the documentElement (it's too darn big!)
-    if (aElement.nodeType == 1 && aElement != aElement.ownerDocument.documentElement) {
+    if (aElement.nodeType == Node.ELEMENT_NODE &&
+        aElement != aElement.ownerDocument.documentElement) {
       var flasher = this.flasher;
       
       if (flasher.flashing) 
diff --git a/extensions/inspector/resources/content/viewers/domNode/domNode.js b/extensions/inspector/resources/content/viewers/domNode/domNode.js
index 3916dca07b4..d671f85552c 100644
--- a/extensions/inspector/resources/content/viewers/domNode/domNode.js
+++ b/extensions/inspector/resources/content/viewers/domNode/domNode.js
@@ -111,7 +111,7 @@ DOMNodeViewer.prototype =
     this.mSubject = aObject;
     var deck = document.getElementById("dkContent");
     
-    if (aObject.nodeType == 1) {
+    if (aObject.nodeType == Node.ELEMENT_NODE) {
       deck.setAttribute("selectedIndex", 0);
       
       this.setTextValue("nodeName", aObject.nodeName);
diff --git a/extensions/inspector/resources/content/viewers/xblBindings/xblBindings.js b/extensions/inspector/resources/content/viewers/xblBindings/xblBindings.js
index 19791c3a7bc..0b7f37c3695 100644
--- a/extensions/inspector/resources/content/viewers/xblBindings/xblBindings.js
+++ b/extensions/inspector/resources/content/viewers/xblBindings/xblBindings.js
@@ -490,7 +490,7 @@ function ResourceTreeView(aBinding)
   if (res && res.length) {
     var kids = res[0].childNodes;
     for (var i = 0; i < kids.length; ++i)
-      if (kids[i].nodeType == 1)
+      if (kids[i].nodeType == Node.ELEMENT_NODE)
         list.push(kids[i]);
   }
         
@@ -519,4 +519,4 @@ function(aRow, aColId)
 function gDocLoadListener()
 {
   viewer.doDisplayBinding();
-}
\ No newline at end of file
+}