windows.onCreated

browser.windows.onCreated.addListener(listener)
browser.windows.onCreated.removeListener(listener)
browser.windows.onCreated.hasListener(listener)

Events have three functions:

addListener(listener)

Adds a listener to this event.

removeListener(listener)

Stop listening to this event. The listener argument is the listener to remove.

hasListener(listener)

Check whether a listener is registered for this event. Returns true if it is listening, false otherwise.

listener

The function called when this event occurs. The function is passed this argument:

window

A windows.Window object containing details of the window that was created.

Log the IDs of new windows as they are created:

browser.windows.onCreated.addListener((window) => {
  console.log(`New window: ${window.id}`);
});

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