diff --git a/modules/browser.js b/modules/browser.js
index 367edd3e..10dd5f41 100644
--- a/modules/browser.js
+++ b/modules/browser.js
@@ -4951,6 +4951,11 @@ TreeStyleTabBrowser.prototype = inherit(TreeStyleTabWindow.prototype, {
 		}
 
 		if (isContentResize || isChromeResize) {
+			if (utils.isDebugging('browser')) {
+				dump('TSTBrowser_onResize\n');
+				dump('  isContentResize = '+isContentResize+'\n');
+				dump('  isChromeResize = '+isChromeResize+'\n');
+			}
 			this.updateFloatingTabbar(this.kTABBAR_UPDATE_BY_WINDOW_RESIZE);
 			this.updateInvertedTabContentsOrder(true);
 			this.mTabBrowser.mTabContainer.adjustTabstrip();
diff --git a/modules/browserUIShowHideObserver.js b/modules/browserUIShowHideObserver.js
index f5c85370..abd05c22 100644
--- a/modules/browserUIShowHideObserver.js
+++ b/modules/browserUIShowHideObserver.js
@@ -90,8 +90,10 @@ BrowserUIShowHideObserver.prototype = {
 				switch (aMutation.type)
 				{
 					case 'childList':
-						if (aMutation.target == this.box)
+						if (aMutation.target == this.box) {
+							this.dumpMutation(aMutation, 'BrowserUIShowHideObserver_onMutation/childList');
 							this.owner.browser.treeStyleTab.updateFloatingTabbar(TreeStyleTabConstants.kTABBAR_UPDATE_BY_WINDOW_RESIZE);
+						}
 						return;
 
 					case 'attributes':