Feature Definition

In the experimentation ecosystem, experiment surfaces are described as features. A feature is an area of code instrumented with telemetry and accessible for remote configuration. It can be as small as a single function or as complex as a whole page. Some examples:

aboutwelcome: The about:welcome page in Desktophomescreen: The homescreen page in FenixtabTrayFeature: The tab tray in Firefox iOS

Features are defined in a Feature Manifest file for the application, and the client code uses the Nimbus SDK to access variables associated with those features.

To define your feature in the feature manifest file

First, look at what is already defined in the manifest file:

• Desktop
• Mobile
  • Fenix/Android
  • Firefox iOS
  • Focus iOS