There is another issue with the active tab. There is no top margin, which makes the tab stick to the navigation bar. Also, there is no left margin on the left-most tab, which makes it stick to the left border of the screen when Firefox is maximized. 1px at the top and 1px on the left would already make it look much better.
System: Ubuntu 9.04 (default theme)
The red arrows on the attached screenshot show where the problem is.
There is another issue with the active tab. There is no top margin, which makes the tab stick to the navigation bar. Also, there is no left margin on the left-most tab, which makes it stick to the left border of the screen when Firefox is maximized. 1px at the top and 1px on the left would already make it look much better.
System: Ubuntu 9.04 (default theme)
The red arrows on the attached screenshot show where the problem is.