The applet is from mindbright.

Q29) When I use MindTerm in Netscape on Linux with black background the popup-menu
can't be used since it's black-on-black, how can I fix this?
A29) There is a bug in Netscape on Linux making the popup inherit the black
background from the main-window while keeping the text black . I don't know how
to fix this.

    Workaround (from D Roland Walker ):
netscape -xrm "netscape*drawingArea*canvas.canvas.XmMenuShell*XmRowColumn*foreground:lightgray"
    OR
Make it permanent by adding the following to your ~/.Xdefaults file:
netscape*drawingArea*canvas.canvas.XmMenuShell*XmRowColumn*foreground:lightgray"
Note that you may have to substitute "netscape" with one of the following:
    Netscape
    netscape-communicator
    netscape-navigator