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# [Android Components](../../../README.md) > Support > Webextensions
A component containing building blocks for features implemented as web extensions.
Usually this component never needs to be added to application projects manually. Other components may have a transitive dependency on some of the classes and interfaces in this component.
## Usage
### Setting up the dependency
Use Gradle to download the library from [maven.mozilla.org](https://maven.mozilla.org/) ([Setup repository](../../../README.md#maven-repository)):
```Groovy
implementation "org.mozilla.components:support-webextensions:{latest-version}"
```
## Facts
This component emits the following [Facts](../../support/base/README.md#Facts):
| Action | Item | Extras | Description |
|-------------|----------------------------|-------------------|---------------------------------|
| Interaction | web_extensions_initialized | `extensionExtras` | Web extensions are initialized. |
#### `extensionExtras`
| Key | Type | Value |
|-------------|--------------|---------------------------------------|
| "enabled" | List<String> | List of enabled web extension ids. |
| "installed" | List<String> | List of installed web extensions ids. |
## License
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this