[android-components](../../index.md) / [mozilla.components.browser.engine.gecko.webextension](../index.md) / [GeckoWebExtension](index.md) / [isBuiltIn](./is-built-in.md)

# isBuiltIn

`fun isBuiltIn(): `[`Boolean`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/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/webextension/GeckoWebExtension.kt#L362)

Overrides [WebExtension.isBuiltIn](../../mozilla.components.concept.engine.webextension/-web-extension/is-built-in.md)

Checks whether or not this extension is built-in (packaged with the
APK file) or coming from an external source.

