+ Cleaned up TabItem bounds getting and setting (the translation between our coordinates and the div style needs to be done carefully, in particular due to the padding in the tab style), and added a unit test for it

browser/base/content/tabview/iq.js

@@ -444,14 +444,8 @@ iQ.fn = iQ.prototype = {
   // Function: bounds
   bounds: function(unused) {
     Utils.assert('does not yet support setting', unused === undefined);
-    Utils.assert('does not yet support multi-objects (or null objects)', this.length == 1);
-    var el = this[0];
-    return new Rect(
-      parseInt(el.style.left) || el.offsetLeft, 
-      parseInt(el.style.top) || el.offsetTop, 
-      el.clientWidth,
-      el.clientHeight
-    );
+    var p = this.position();
+    return new Rect(p.left, p.top, this.width(), this.height());
   },
   
   // ----------

browser/base/content/tabview/modules/utils.jsm

@@ -544,16 +544,6 @@ var Utils = {
   	return date.getTime();
   },
   
-  // ___ Geometry
-  getBounds: function(el) {
-    return new Rect(
-      parseInt(el.style.left) || el.offsetLeft, 
-      parseInt(el.style.top) || el.offsetTop, 
-      el.clientWidth,
-      el.clientHeight
-    );
-  },
-
   // ___ Misc
   isDOMElement: function(object) {
     return (object && typeof(object.nodeType) != 'undefined' ? true : false);