Bug 853973 - If a plugin is overlayed by other content on the page, then treat it as a hidden plugin: hide the overlay and present the infobar for click-to-play or crashed plugins, r=jaws
Bug 932832 - click-to-play not discoverable for Google Hangouts video plugin because it is positioned at -40000,-40000. Check for positioning and treat this as a hidden plugin, r=jaws