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Created attachment 274669 [details] Screenshot
As TabFolder does not allow to set the background color, the current solution for this is to switch to CTabFolder.
For information, I don't see any problems in the latest version of Eclipse IDE. Build informations: Eclipse IDE for Java Developers Version: 2019-12 (4.14.0) Build id: 20191212-1212 OS: Linux, v.5.4.19-200.fc31.x86_64, x86_64 / gtk 3.24.13 Java version: 1.8.0_242 OS informations: Fedora 31 Theme: Adwaita @Lars, is this fixed for you too?
Created attachment 281880 [details] Configuration preferences under Fedora 31
Looks better these days on latest Ubuntu (and on Windows)