[android-components](../../../index.md) / [mozilla.components.concept.engine](../../index.md) / [EngineSession](../index.md) / [Observer](index.md) / [onBrowserActionChange](./on-browser-action-change.md)

# onBrowserActionChange

`open fun onBrowserActionChange(webExtensionId: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`, action: `[`BrowserAction`](../../../mozilla.components.concept.engine.webextension/-browser-action/index.md)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/concept/engine/src/main/java/mozilla/components/concept/engine/EngineSession.kt#L66)

Event to notify that a web extension browser action has changed.

