When I have only one tab open and then open a second tab, the tabbar changes height by a few pixels. Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050531 Firefox/1.0+
Created attachment 186229 [details] Favicons turned on Ok, so it seems that by setting the favicons on the tab bar to display:none is causing this. That means that the Chrome is relying on the image to hold the box open. Minor issue.
*** This bug has been marked as a duplicate of 246186 ***