User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:2.0b12) Gecko/20100101 Firefox/4.0b12 Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b12) Gecko/20100101 Firefox/4.0b12 I think the tab bar should be shown when only single "pinned" tab is open, when always show tab bar is unchecked in options. This is normal behavior for norma tabs but when its a pin tab I tink the tab bar should be shown so that you can tell that its a "pinned" app/tab Reproducible: Always Steps to Reproduce: 1. open a 2nd tab while having always how tab bar unchecked. 2. pin one of the tabs 3. close the non pinned tab Actual Results: tab bar is hidden from view Expected Results: tab bar should remiain with the smaller version of the tab for pinned tabs shown

See Bug 594614

The option to hide the tabbar has been removed by bug 855370.