[android-components](../../index.md) / [mozilla.components.browser.engine.gecko](../index.md) / [GeckoEngine](index.md) / [listInstalledWebExtensions](./list-installed-web-extensions.md)

# listInstalledWebExtensions

`fun listInstalledWebExtensions(onSuccess: (`[`List`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html)`<`[`WebExtension`](../../mozilla.components.concept.engine.webextension/-web-extension/index.md)`>) -> `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)`, onError: (`[`Throwable`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-throwable/index.html)`) -> `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/browser/engine-gecko-beta/src/main/java/mozilla/components/browser/engine/gecko/GeckoEngine.kt#L337)

Overrides [WebExtensionRuntime.listInstalledWebExtensions](../../mozilla.components.concept.engine.webextension/-web-extension-runtime/list-installed-web-extensions.md)

See [Engine.listInstalledWebExtensions](../../mozilla.components.concept.engine.webextension/-web-extension-runtime/list-installed-web-extensions.md).

