management.onInstalled()

browser.management.onInstalled.addListener(listener)
browser.management.onInstalled.removeListener(listener)
browser.management.onInstalled.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)

Checks 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:

info

ExtensionInfo: info about the add-on that was installed.

Log the names of add-ons when they are installed:

browser.management.onInstalled.addListener((info) => {
  console.log(`${info.name} was installed`);
});