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The NYTimes animation of the Canadian fires air quality effect froze Firefox, mouse, and keyboard on CentOS 7 for me. I could ssh in from another system, kill -9 Firefox and it recovered.

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That's on X windows honestly. It shouldn't be possible for a badly behaved program to bring down the window manager and/or display server.

If you can do that you should also be able to just open up a virtual terminal with Control-Alt-F1, just saying :)

Nope: I tried that. No response to any common keyboard combo. As suggested in a sibling comment, X11 shares the blame.

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