This is very minor though a bit suprising. Not so easy to descrbe, so there is an attached screenshot
Ubuntu karmic koala/ kpz version : 0.8b2 (20100221)
partial extra px border
Fabien Cazenave (kaze)
Ugh, somebody's noticed it. I confirm this bug.
That's because I've had to hide the tabs completely in some cases in the CSS Editor. And when the tabs are hidden, that's how it looks like.
I know it's ugly but:
1/ few people notice it
2/ I haven't found any way to disable tabs properly with Gecko 1.8.1, so I've had to hide them.
-- kazé, kompozer lead dev.