This is the following up CR of 6673601. Fix to 6673601 has fixed the issue on windows. However, on Solaris/Liunx firefox3, applet areas are created of background color gray/white.
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EVALUATION
The XEmbedded protocol used in Java Plug-in on unix platforms create a XEmbed socket in the browser. Plug-in embedded frame is XEmbed plug. Before the embedded frame is connected to the socket, the socket area is painted with some default color. Need investigate if there is APIs that can be used to inform browser to paint socket area with requested color.