Welcome

Welcome to the Experimenter documentation hub, your central resource for A/B experiments and feature rollouts in Firefox Mobile and Desktop. You should find these documents helpful if you are:

• A product manager and you have a hypothesis you want to test or a feature you'd like to safely release.
• An engineer who needs to implement an experiment or feature rollout in your client
• A data scientist helping to design and interpret experiment results
• A Mozilla leader who would like insight into completed and ongoing experiments and rollouts.

What is covered here?

These documents are specific to the Mozilla experimentation program known as Nimbus. Nimbus experimentation and support is currently available for our Firefox Desktop and Mobile browser applications.

Our platform code is all open-source however, we do not offer support or services to 3rd party consumers. Some documentation links may only be available to Mozilla employees and NDA contributors.

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Platform Capabilities

Nimbus is a full-featured experimentation platform that provides configuration, analysis and client libraries for both experiments and rollouts.

Experimenter Console

• Simple experiment configuration UI
• Pre-launch testing support
• Multifeature experiments
• Rollouts
• Simple targeting
• Advanced customizable targeting
• Adding Metrics to your Experiment
• Remote settings integration
• Experiment Review / Approval Workflow
• Dashboards
• Monitoring and Analysis

Multiple Language Client Integrations

• Android (Kotlin)
• iOS (Swift)
• Firefox Desktop Frontend (JS)
• Firefox Platform (C++)

Client-side Functionality

• Consumer opt-out
• Integration with console preview testing
• View experiments (about:studies)

Current Client Integrations

• Firefox Desktop
  • Frontend via JS SDK
  • Platform
  • Windows installer
• Firefox Mobile via Nimbus-SDK Rust Component
  • Fenix
  • Firefox iOS
  • Focus Android
  • Focus iOS

Current Feature Support

• Documented here: feature definitions

Requesting Feature Support

If you aren't sure we have what you need, pop into #ask-experimenter with your questions or file an issue

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Need Help? Not Sure Where to Start?

⭐️ Reach out in #ask-experimenter on Slack
⭐️ Join office hours with data science

In this documentation...

⭐️ Take a look at the Getting Started section if you are brand new
⭐️ Check out our Experimentation Workflow to get started
⭐️ Check the Glossary for terms you are unfamiliar with
⭐️ Ask in slack at ask-experimenter for guidance on where to get started

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About these docs

This website is built using Docusaurus. If you'd like to edit or add to them, check out the Contributing page.