getFocusedPrimaryTabId()

Returns the ID of the primary tab on which the browser is focused. This method is only available in API version 25.0 or later.

Name	Type	Description
`callback`	function	JavaScript method that’s called upon completion of the method.

This method is asynchronous so it returns its response in an object in a callback method. The response object contains the following fields:

Name	Type	Description
`id`	string	The ID of the primary tab on which the browser is focused. If no primary tab is open, the ID is null.
`success`	boolean	`true` if returning the primary tab ID on which the browser is focused was successful; `false` if returning the primary tab ID on which the browser is focused wasn’t successful.