Tab focus in maximized window Rated 4 out of 5 stars

Clean theme, very nice.
The only thing which is strange is that I dont get focus on tabs in titlebar in maximized window if I click at the very top of the screen/tab.
Do you know what I mean? Is there a way to change this by userChrome.css?
Thx for help.

This review is for a previous version of the add-on (5.0.2).