theme.onUpdated

Fires when a theme supplied as a browser extension is applied or removed. Specifically:

when astatic theme is installed
when adynamic theme callstheme.update() ortheme.reset()
when a theme gets uninstalled.

This event is not fired for changes to the built-in themes.

Syntax

browser.theme.onUpdated.addListener(listener)browser.theme.onUpdated.removeListener(listener)browser.theme.onUpdated.hasListener(listener)

Events have three functions:

addListener(listener): Adds a listener to this event.
removeListener(listener): Stop listening to this event. Thelistener argument is the listener to remove.
hasListener(listener): Check whetherlistener is registered for this event. Returnstrue if it is listening,false otherwise.

addListener syntax

Parameters

listener

The function called when this event occurs. The function is passed these arguments:

updateInfo

object. An object containing two properties:

theme: object. If the event fired because an extension-supplied theme was removed, this is an empty object. If it fired because an extension-supplied theme was applied, then it is atheme.Theme object representing the theme that was applied.
windowIdOptional: integer. The ID of the window in which the theme was updated. If this property is not present, the theme was updated in all windows.

Examples

function handleUpdated(updateInfo) {  if (updateInfo.theme.colors) {    console.log(`Theme was applied: ${updateInfo.theme}`);  } else {    console.log(`Theme was removed`);  }}browser.theme.onUpdated.addListener(handleUpdated);