The important aspect of my original report was that not only did it grab
100% CPU, but it appears that the plugin grabbed all keyboard/mouse
input.  In other cases where something eats 100% CPU, the OS scheduler
allows other processes to work anyhow, so if I click on some other app's
windows, that app will take focus.  In this case, it appears that
although the cursor moves, all input is being lost.  This is classic
behavior of an app that does a full X server grab and doesn't release
the grab.  My suggestion would be to put limits on the kinds of grabs
that plugins are allowed to make.  Never trust the plugin to do the
right thing, especially a proprietary one from a relatively
disinterested vendor.

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nspluginviewer hangs up whole X server
https://bugs.launchpad.net/bugs/66573
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