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Explanations of common acronyms that are seen in the Fenix project boards and issues.
**AC**: "[Android Components](https://github.com/mozilla-mobile/android-components)", the Mozilla team responsible for componentization.
**AS**: "[Application Services](https://github.com/mozilla/application-services)", the Mozilla team responsible for sync and storage (logins, bookmarks, etc).
**CFR**: "Contextual feature recommendation", i.e. popup windows.
**CTA**: "Call to action", a marketing/product term for things that pop up and ask for user interaction.
**ETP**: "Enhanced tracking protection". The shield icon.
**PWA**: "[Progressive web application](https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps)", Fenix can act as a host for these applications.
**FCM**: "Firebase Cloud Messaging", is the Firebase service used to deliver WebPush messaging to web apps and Firefox Send Tab, to Android devices that have [Google Play Services](https://en.wikipedia.org/wiki/Google_Play_Services).
**PTR**: "[Pull-to-refresh](https://developer.android.com/develop/ui/views/touch-and-input/swipe)", is the feature to refresh the website the user is currently on when pulling down from the top of the page.