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From a fresh Ubuntu 12.04 install I tried multiple desktops, and settled on KDE. One problem I have with it is how scrollbars are displayed in Thunderbird:

enter image description here

In Gimp, Dolphin, Firefox there are completely normal scrollbars. I checked on unity and this didn't happen there.

How do I change this?

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Thunderbird is a GTK application. It looks like you have the oxygen-GTK theme selected for GTK, so it's using the KDE-style scrollbars. Not sure why it doesn't affect the other apps. – Mechanical snail Dec 19 '12 at 0:51
Have you tried disabling the overlay scrollbar as mentioned here:… – somoso Jan 7 '13 at 20:25
@somoso, AFAICT, the overlay scrollbar doesn't work for Thunderbird. Disabling it will not help resolve OP's issue. – user25656 Jan 13 '13 at 15:53
It looks like you're using QtCurve. Try switching GTK+ theme – Janus Troelsen Jan 18 '13 at 12:37
Go to System Settings -> Application Appearance -> Gtk Configuration -> GTK Themes. What options are selected? Post a screenshot of that dialog. – Ken Kinder Jan 18 '13 at 21:21

It's possible that the other apps look different because while using GTK they may be using a different version, GTK2 vs GTK3. You should search for oxygen-GTK and verify that you have a GTK3 and GTK2 version installed to cover both of the major gnome toolkits.

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sudo apt-get autoremove overlay-scrollbar*
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which will do what exactly? – underscore_d Oct 9 '15 at 18:14
@underscore_d It removes support for GTK's overlay scrollbar and forces it to use the old (and in my opinion, better) flat scrolbars. – Bharadwaj Raju Mar 16 at 12:32

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