Tab not displayed after tearing off

[GoogleCodeExporter]

What steps will reproduce the problem?

1. Have a window with more tabs inside

2. Tear off one tab (click on that tab and drag it downwards)

3. The page inside that tab will be moved to a new window

4. The new window won't have any tab associated to that page!

5. With no tab displayed, it is impossible to drag the page back to the 
original window

What is the expected output? What do you see instead?

after 3. the new window is expected to display a tab beside the new tab button 
(the one with a '+' on), but only the new tab button is displayed

What version of the product are you using? On what operating system?

Firefox 8.0 for Ubuntu - Canonical 1.0 on Kubuntu 11.10
Hackbar 1.6.1

Please provide any additional information below.

The issue only occurs when Hackbar extension is enabled

Original issue reported on code.google.com by gi4c...@gmail.com on 28 Nov 2011 at 11:24