When the side panels are horizontally too small to display their tabs completely, they overlap on the outer border of Firebug, though there is no option to bring them into display.
When switching away from the Firebug theme and back to it and resize the side panels you'll see an overflow menu button:
Though that button disappears when you shrink the side panels again, i.e. it's not positioned correctly.
So one solutions to this is to correct the display of this side panel overflow button.
A second solution would be to have scroll arrows at the left and right of the panel tabs in this case like for the main panel tabs.
When the side panels are horizontally too small to display their tabs completely, they overlap on the outer border of Firebug, though there is no option to bring them into display.
When switching away from the Firebug theme and back to it and resize the side panels you'll see an overflow menu button:
Though that button disappears when you shrink the side panels again, i.e. it's not positioned correctly. So one solutions to this is to correct the display of this side panel overflow button. A second solution would be to have scroll arrows at the left and right of the panel tabs in this case like for the main panel tabs.
Sebastian