Bug 899347 split up click-to-play so that the bits that handle events from content are dealt with in content scripts, and the message manager is used to communicate with the parent to do things like display popup notifications or notification bars. With e10s, it's possible for a tab to crash, but the browser to remain operable. If a popup notification or notification bar is opened for some content, and then that content process crashes... those notification bars and popup notifications will probably stick around. We should probably check to see if that occurs, and if it does, make it so that we clean up notifications if the content process crashes.
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