Bug 934774 - Intermittent exception is killing mochitests (primarily browser_pluginnotification.js) because we're dispatching an event to a document which is already dead. Check it's aliveness before dispatching, r=johns

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extra : rebase_source : b12ee9219793da46ebec5b1a770f3a1d80ea4c66
Bug 934503 - Activated hidden plugins should not show the hidden plugin notification icon, r=jaws

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extra : rebase_source : bdae17aa44e5fbe60d724b3ad98f679da9c851f1