A set of functions providing more information and utilities regarding the current extension.
Retrieves an extra object (providing external APIs) registered in the extension’s manifest.
Parameter: name <string>he name of the object as appears in the manifest.
Parameter: callback <function>A function called with the extra object, if found, and a status indicating success or failure.
Returns the current extension’s manifest object.
Parameter: callback <function>A function called with the manifest data.