When Firefox was linked against GTK 3, it broke the tooltip color scheme in Kubuntu 14.04. Tooltips became black text on black background.

You can fix the problem by editing /usr/share/themes/oxygen-gtk/gtk-3.0/kdeglobals.

Change the section [Colors:Tooltip]:

BackgroundNormal=24,21,19
BackgroundNormal=255,255,255

The new tooltip background colour will be white.

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