Comment 129 for bug 14911

Originally, I had the same issue Dominik Dresel reported at the very top. The issue reported here:

XServer uses the composite extension und has the color-depth set to 16 bit.
If the composite extension is switched off or the color-depth is set to 24 bit,
the problem doesn´t occour.

Why is this important? Well, lots of people still have older hardware that they want to use, such as my old Toshiba notebook that still works good as long as it's in 16 bit color mode.

In any case, the plugin fails in this configuration and crashes the browser. Perhaps there is a way just to terminate the plugin without crashing the browser in this case (secondary issue)

Primary issue is the XServer settings vs compatibility with the plugin in 16 bit color mode.