custom mouse pointer switches to default on FF context menu open and at desktop border

current Tumbleweed

I use DMZ white cursor with different size than default. This works fine but when I right click in Firefox, the pointer switches to default black and tiny size but goes back to dmz white when moving into the context menu. I thought this might be some GTK glitch but the same happens when moving the mouse to plasma desktop egde. On the last few pixels the big white cursor changes to tiny black.

Any ideas where to look for clues? Or how to override system default once and for all? I do have the cursor theme and size set in ~/.Xresources and several gtkrc files

Known bug. Comment 2 in this bug report has a workaround:

https://bugs.kde.org/show_bug.cgi?id=459670

Obviously change the “Inherits=” to match your normal cursor theme.