This guide will help you preview what each branch of an experiment will look like for users in the target application.
These steps only apply to Firefox Desktop Version 90+. Instructions for Fenix and iOS are coming soon.
- For experiments that are already live, go to the summary page. For experiments that have not yet launched, you will need the author to click "Launch to Preview" on the Review & Launch page.
Scroll down to the Preview Url section of the page. Select the branch you want and copy the
about:configin Firefox Desktop v90+ and set
true. Paste the URL you copied above in your browser.
You should be enrolled! To exit the experiment, go to
about:studiesand click "Remove"
To use preview with earlier versions of Firefox, you can use your Browser Toolbox devtools to run this code snippet.