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Desktop Local Experiment Iteration
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desktop-enroll-locally.md
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desktop-enroll-locally
Desktop Local Experiment Iteration
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Debugging an experiment from experimenter locally

Trying to iterate on an experiment in Preview on experimenter.services.mozilla.com can be painful, because even after you change something and post to preview, you have a wait a while for the updated recipe to be propagated to the CDN.

Enable Nimbus debugging

  • In about:config, set or create:
    • nimbus.debug to true
    • devtools.chrome.enabled to true
    • devtools.debugger.remote-enabled to true
  • Open Tools > Browser Tools > Browser Toolbox
  • Load about:studies and unenroll this profile from anything that might interfere
  • Switch to the browser console
  • In the input box, do the following:
    • const { ExperimentManager: em } = ChromeUtils.import("resource://nimbus/lib/ExperimentManager.jsm");
    • let recipe = paste_recipe_json_here ;
    • const branchSlug = 'treatment-a'; # or whatever branch you want
    • let branch = recipe.branches.find(b => b.slug == branchSlug);
    • em.forceEnroll(recipe, branch);
  • Reload about:studies, and you should see the experiment
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