Apparently firefox stops responding to ping events.
http://standards.freedesktop.org/wm-spec/1.4/ar01s06.html
** Changed in: compiz (Ubuntu)
Status: Incomplete => New
** Also affects: firefox (Ubuntu)
Importance: Undecided
Status: New
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Firefox greyed out, even though it's responding
https://bugs.launchpad.net/bugs/124581
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