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You need to edit ~/.fluxbox/init, find the related entry and change its value from NORMAL (the default) to BORDER:
session.screen0.defaultDeco: BORDER
Now save and choose reconfigure or restart from the rootmenu, all apps will show ONLY a border now (if the styles uses one). You can also change the pixelwidth and the color of the border.
Either do it globally using the overlay file or separately for every single style.
In both cases you need to add three lines to the appropriate file:
window.borderWidth: window.focus.borderColor: window.unfocus.borderColor:
The meaning should be quite obvious, the integer defines the width for the border in pixel, and the color is the actual color of the border, both for when the window is focused or not.
Since external tabs returned in fluxbox 1.0rc you can use them the common way (tabs sit on a full decorated window) or the special way. Following the guidelines from the above set up, you can configure your ~/.fluxbox/init file like this:
session.screen0.defaultDeco: TAB
You will get a window with border (as described above) but with a nice tab attached as set in the "tab" section of the rootmenu.