Breeze GTK theme
The Breeze GTK Theme is what makes GTK applications look at home in KDE Plasma. To the extent that they don't, this is one of the primary places to fix those bugs.
Top bugs and feature requests
- When using the Breeze GTK theme, GTK windows should use colors from the KDE color scheme: https://bugs.kde.org/show_bug.cgi?id=356006 & https://bugs.kde.org/show_bug.cgi?id=357524
- GTK3 CSD windows are impossible or very difficult to resize: https://bugs.kde.org/show_bug.cgi?id=390550
- Active and inactive states for GTK3 CSD windows are indistinguishable: https://bugs.kde.org/show_bug.cgi?id=403426
- Menus don't get shadows: https://bugs.kde.org/show_bug.cgi?id=365924
- After clicking on a places panel entry in the GTK2 file dialog, the filename text becomes invisible: https://bugs.kde.org/show_bug.cgi?id=379299
- Chrome/Chromium's active tabs look identical to inactive tabs: https://bugs.kde.org/show_bug.cgi?id=403108