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Quick Summary

The following document will list all the important about:config preferences that are used when installing a telemetry experiment. If there's anything missing from the list that should be included, please don't hesitate to contact me or add it yourself!

Setting about:config Preferences

Quick Note: Some of these are not listed in about:config and will need to be created manually

    • enables browser chrome and add-on debugging toolboxes
  • experiments.activeExperiment
    • Indicates if there's an experiment currently active/installed
  • experiments.enabled
    • Indicates if the experiments are currently enabled/disabled (enabled by default)
  • experiments.logging.dump
    • Example: Services.prefs.setBoolPref("experiments.logging.dump", true);
      • will also dump logs into stdout and the browser console
  • experiments.logging.level
    • Example: Services.prefs.setCharPref("experiments.logging.level", "Trace");
      • Changing this to 0 or Trace will give you the ability to view the logs under the Browser Console. You'll have to enable Chrome and addon debugging. Please see Setting up Logging
  • experiments.force-sample-value
    • Example: Services.prefs.setCharPref("experiments.force-sample-value", ".1"); (this will change the sample value to 10%)
      • The staging server uses a sample value that dictates what percentage of users will get the experiment, ensure this value matches the servers .JSON file or it will take you a very long time to retrieve the experiment from the server
  • experiments.manifest.cert.checkAttributes
    • If you're connecting to a development or local staging server, change this to false or the certificate authentication will fail when contacting the staging server
  • experiments.supported
    • Indicates if experiments are currently supported
  • experiments.manifest.uri
    • Points to the manifest .JSON file that will be used to download and set the experiment
  • experiments.manifest.fetchIntervalSeconds
    • Number of seconds before Firefox fetches the experiment manifest
  • extensions.bootstrappedAddons
    • Ensure that experiments are not being added into this preference under about:config. This preference is the quick access cache that's used on startup to see what bootstrap extension to load when Firefox initially launches. This should only be listing currently installed add-ons in a JSON format