[android-components](../../index.md) / [mozilla.components.browser.session.tab](../index.md) / [CustomTabConfig](index.md) / [closeButtonIcon](./close-button-icon.md)

# closeButtonIcon

`val closeButtonIcon: <ERROR CLASS>?` [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/browser/session/src/main/java/mozilla/components/browser/session/tab/CustomTabConfig.kt#L35)

Custom icon of the back button on the toolbar.

### Property

`closeButtonIcon` - Custom icon of the back button on the toolbar.