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Border under inactive tab css


I've enlarged a copy of a tab by 5x nearest neighbor for clarity: http://i.imgur.com/ONGSYT9.png

What is causing that line to be generated for an inactive tab? Is there any css to get rid of it? I would like to avoid

   #TabsToolbar { margin-bottom: -1px !important; }

fix, because that just hides the issue, which will manifest itself in taboverflow/windowed mode.

Thank you.

Modified by boogerlad

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10750 solutions 96736 answers

Try to ask in this MozillaZine forum thread.