--- a/toolkit/components/telemetry/TelemetryEnvironment.jsm
+++ b/toolkit/components/telemetry/TelemetryEnvironment.jsm
@@ -182,16 +182,17 @@ const RECORD_PREF_STATE = TelemetryEnvir
 const RECORD_PREF_VALUE = TelemetryEnvironment.RECORD_PREF_VALUE;
 const RECORD_DEFAULTPREF_VALUE = TelemetryEnvironment.RECORD_DEFAULTPREF_VALUE;
 const RECORD_DEFAULTPREF_STATE = TelemetryEnvironment.RECORD_DEFAULTPREF_STATE;
 const DEFAULT_ENVIRONMENT_PREFS = new Map([
   ["app.feedback.baseURL", {what: RECORD_PREF_VALUE}],
   ["app.support.baseURL", {what: RECORD_PREF_VALUE}],
   ["accessibility.browsewithcaret", {what: RECORD_PREF_VALUE}],
   ["accessibility.force_disabled", {what:  RECORD_PREF_VALUE}],
+  ["app.shield.optoutstudies.enabled", {what: RECORD_PREF_VALUE}],
   ["app.update.auto", {what: RECORD_PREF_VALUE}],
   ["app.update.enabled", {what: RECORD_PREF_VALUE}],
   ["app.update.interval", {what: RECORD_PREF_VALUE}],
   ["app.update.service.enabled", {what: RECORD_PREF_VALUE}],
   ["app.update.silent", {what: RECORD_PREF_VALUE}],
   ["app.update.url", {what: RECORD_PREF_VALUE}],
   ["browser.cache.disk.enable", {what: RECORD_PREF_VALUE}],
   ["browser.cache.disk.capacity", {what: RECORD_PREF_VALUE}],