[android-components](../../index.md) / [mozilla.components.feature.accounts](../index.md) / [FxaWebChannelFeature](./index.md)

# FxaWebChannelFeature

`class FxaWebChannelFeature : `[`SelectionAwareSessionObserver`](../../mozilla.components.browser.session/-selection-aware-session-observer/index.md)`, `[`LifecycleAwareFeature`](../../mozilla.components.support.base.feature/-lifecycle-aware-feature/index.md) [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/feature/accounts/src/main/java/mozilla/components/feature/accounts/FxaWebChannelFeature.kt#L49)

Feature implementation that provides Firefox Accounts WebChannel support.
For more information https://github.com/mozilla/fxa/blob/master/packages/fxa-content-server/docs/relier-communication-protocols/fx-webchannel.md
This feature uses a web extension to communicate with FxA Web Content.

### Types

| Name | Summary |
|---|---|
| [WebChannelCommand](-web-channel-command/index.md) | `enum class WebChannelCommand` |

### Constructors

| Name | Summary |
|---|---|
| [&lt;init&gt;](-init-.md) | `FxaWebChannelFeature(context: <ERROR CLASS>, customTabSessionId: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`?, engine: `[`Engine`](../../mozilla.components.concept.engine/-engine/index.md)`, sessionManager: `[`SessionManager`](../../mozilla.components.browser.session/-session-manager/index.md)`, accountManager: `[`FxaAccountManager`](../../mozilla.components.service.fxa.manager/-fxa-account-manager/index.md)`, fxaCapabilities: `[`Set`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-set/index.html)`<`[`FxaCapability`](../-fxa-capability/index.md)`> = emptySet())`<br>Feature implementation that provides Firefox Accounts WebChannel support. For more information https://github.com/mozilla/fxa/blob/master/packages/fxa-content-server/docs/relier-communication-protocols/fx-webchannel.md This feature uses a web extension to communicate with FxA Web Content. |

### Inherited Properties

| Name | Summary |
|---|---|
| [activeSession](../../mozilla.components.browser.session/-selection-aware-session-observer/active-session.md) | `open var activeSession: `[`Session`](../../mozilla.components.browser.session/-session/index.md)`?`<br>the currently observed session |

### Functions

| Name | Summary |
|---|---|
| [onSessionAdded](on-session-added.md) | `fun onSessionAdded(session: `[`Session`](../../mozilla.components.browser.session/-session/index.md)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>The given session has been added. |
| [onSessionRemoved](on-session-removed.md) | `fun onSessionRemoved(session: `[`Session`](../../mozilla.components.browser.session/-session/index.md)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>The given session has been removed. |
| [start](start.md) | `fun start(): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) |

### Inherited Functions

| Name | Summary |
|---|---|
| [observeFixed](../../mozilla.components.browser.session/-selection-aware-session-observer/observe-fixed.md) | `fun observeFixed(session: `[`Session`](../../mozilla.components.browser.session/-session/index.md)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Starts observing changes to the specified session. |
| [observeIdOrSelected](../../mozilla.components.browser.session/-selection-aware-session-observer/observe-id-or-selected.md) | `fun observeIdOrSelected(sessionId: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`?): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Starts observing changes to the session matching the [sessionId](../../mozilla.components.browser.session/-selection-aware-session-observer/observe-id-or-selected.md#mozilla.components.browser.session.SelectionAwareSessionObserver$observeIdOrSelected(kotlin.String)/sessionId). If the session does not exist, then observe the selected session. |
| [observeSelected](../../mozilla.components.browser.session/-selection-aware-session-observer/observe-selected.md) | `fun observeSelected(): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Starts observing changes to the selected session (see [SessionManager.selectedSession](../../mozilla.components.browser.session/-session-manager/selected-session.md)). If a different session is selected the observer will automatically be switched over and only notified of changes to the newly selected session. |
| [onSessionSelected](../../mozilla.components.browser.session/-selection-aware-session-observer/on-session-selected.md) | `open fun onSessionSelected(session: `[`Session`](../../mozilla.components.browser.session/-session/index.md)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>The selection has changed and the given session is now the selected session. |
| [stop](../../mozilla.components.browser.session/-selection-aware-session-observer/stop.md) | `open fun stop(): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html)<br>Stops the observer. |
