Fired when a message is sent from either an extension
(by runtime.sendMessage) or a content script (by tabs.sendMessage).
https://developer.chrome.com/extensions/runtime#event-onMessage
details for the message
MessageSender object
function to call once after processing
true if asynchronous
KeyboardEvent
Fired when a registered command is activated using a keyboard shortcut.
https://developer.chrome.com/extensions/commands#event-onCommand
keyboard command
mouse click
mousemove
mousemove event
Listen for events
Close ourselves
Stop listening for events
Starting mouse position
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Event handling for a screensaver