Bug 1972647 - Don't hide Firefox Labs when studies or telemetry are disabled r=mkaply,akulyk

The UserMessaging:FirefoxLabs policy no longer has to set the
"browser.preferences.experimental" pref because whether or not the
Firefox Labs pane is registered is determined by the "FirefoxLabs"
policy feature.

Differential Revision: https://phabricator.services.mozilla.com/D269922

Author: freshstrangemusic

browser/app/profile/firefox.js

@@ -1354,8 +1354,6 @@ pref("accessibility.typeaheadfind.timeout", 5000);
 pref("accessibility.typeaheadfind.linksonly", false);
 pref("accessibility.typeaheadfind.flashBar", 1);
 
-// Whether we can show the "Firefox Labs" section.
-pref("browser.preferences.experimental", true);
 // Whether we had to hide the "Firefox Labs" section because it would be empty.
 pref("browser.preferences.experimental.hidden", false);
 // Whether we show the "More from Mozilla" section.

browser/components/enterprisepolicies/Policies.sys.mjs

@@ -2923,16 +2923,8 @@ export var Policies = {
           param.Locked
         );
       }
-      if ("FirefoxLabs" in param) {
-        if (!param.FirefoxLabs) {
-          manager.disallowFeature("FirefoxLabs");
-        }
-
-        PoliciesUtils.setDefaultPref(
-          "browser.preferences.experimental",
-          param.FirefoxLabs,
-          param.Locked
-        );
+      if ("FirefoxLabs" in param && !param.FirefoxLabs) {
+        manager.disallowFeature("FirefoxLabs");
       }
     },
   },

browser/components/preferences/experimental.js

@@ -26,7 +26,6 @@ const gExperimentalPane = {
 
     this._onCheckboxChanged = this._onCheckboxChanged.bind(this);
     this._onNimbusUpdate = this._onNimbusUpdate.bind(this);
-    this._onStudiesEnabledChanged = this._onStudiesEnabledChanged.bind(this);
     this._resetAllFeatures = this._resetAllFeatures.bind(this);
 
     setEventListener(
@@ -35,10 +34,6 @@ const gExperimentalPane = {
       this._resetAllFeatures
     );
 
-    Services.obs.addObserver(
-      this._onStudiesEnabledChanged,
-      ExperimentAPI.STUDIES_ENABLED_CHANGED
-    );
     window.addEventListener("unload", () => this._removeObservers());
 
     await this._maybeRenderLabsRecipes();
@@ -169,24 +164,8 @@ const gExperimentalPane = {
     }
   },
 
-  async _onStudiesEnabledChanged() {
-    const studiesEnabled = ExperimentAPI.studiesEnabled;
-
-    if (studiesEnabled) {
-      await this._maybeRenderLabsRecipes();
-    } else {
-      this._setCategoryVisibility(true);
-      this._removeLabsRecipes();
-      this._firefoxLabs = null;
-    }
-  },
-
   _removeObservers() {
     ExperimentAPI.manager.store.off("update", this._onNimbusUpdate);
-    Services.obs.removeObserver(
-      this._onStudiesEnabledChanged,
-      ExperimentAPI.STUDIES_ENABLED_CHANGED
-    );
   },
 
   // Reset the features to their default values

browser/components/preferences/preferences.js

@@ -81,6 +81,7 @@ ChromeUtils.defineESModuleGetters(this, {
   ContextualIdentityService:
     "resource://gre/modules/ContextualIdentityService.sys.mjs",
   DownloadUtils: "resource://gre/modules/DownloadUtils.sys.mjs",
+  ExperimentAPI: "resource://nimbus/ExperimentAPI.sys.mjs",
   ExtensionPreferencesManager:
     "resource://gre/modules/ExtensionPreferencesManager.sys.mjs",
   ExtensionSettingsStore:
@@ -242,16 +243,17 @@ function init_all() {
   if (Services.prefs.getBoolPref("browser.translations.newSettingsUI.enable")) {
     register_module("paneTranslations", gTranslationsPane);
   }
-  if (Services.prefs.getBoolPref("browser.preferences.experimental")) {
+  if (ExperimentAPI.labsEnabled) {
     // Set hidden based on previous load's hidden value or if Nimbus is
     // disabled.
     document.getElementById("category-experimental").hidden =
-      !ExperimentAPI.studiesEnabled ||
       Services.prefs.getBoolPref(
         "browser.preferences.experimental.hidden",
         false
       );
     register_module("paneExperimental", gExperimentalPane);
+  } else {
+    document.getElementById("category-experimental").hidden = true;
   }
 
   NimbusFeatures.moreFromMozilla.recordExposureEvent({ once: true });

browser/components/preferences/tests/browser_experimental_features.js

@@ -8,23 +8,6 @@ add_setup(async function setup() {
   registerCleanupFunction(cleanup);
 });
 
-add_task(async function testPrefRequired() {
-  await SpecialPowers.pushPrefEnv({
-    set: [["browser.preferences.experimental", false]],
-  });
-
-  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
-  let doc = gBrowser.contentDocument;
-
-  let experimentalCategory = doc.getElementById("category-experimental");
-  ok(experimentalCategory, "The category exists");
-  ok(experimentalCategory.hidden, "The category is hidden");
-
-  BrowserTestUtils.removeTab(gBrowser.selectedTab);
-
-  await SpecialPowers.popPrefEnv();
-});
-
 add_task(async function testCanOpenWithPref() {
   await SpecialPowers.pushPrefEnv({
     set: [["browser.preferences.experimental", true]],
@@ -58,10 +41,6 @@ add_task(async function testCanOpenWithPref() {
 });
 
 add_task(async function testSearchFindsExperiments() {
-  await SpecialPowers.pushPrefEnv({
-    set: [["browser.preferences.experimental", true]],
-  });
-
   await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
   let doc = gBrowser.contentDocument;
 
@@ -80,6 +59,4 @@ add_task(async function testSearchFindsExperiments() {
   );
 
   BrowserTestUtils.removeTab(gBrowser.selectedTab);
-
-  await SpecialPowers.popPrefEnv();
 });

browser/components/preferences/tests/browser_experimental_features_filter.js

@@ -36,10 +36,6 @@ add_task(async function testFilterFeatures() {
   ];
   const cleanup = await setupLabsTest(recipes);
 
-  await SpecialPowers.pushPrefEnv({
-    set: [["browser.preferences.experimental", true]],
-  });
-
   await BrowserTestUtils.openNewForegroundTab(
     gBrowser,
     "about:preferences#paneExperimental"

browser/components/preferences/tests/browser_experimental_features_hidden_when_not_public.js

@@ -6,10 +6,6 @@
 add_task(async function testNonPublicFeaturesShouldntGetDisplayed() {
   const cleanup = await setupLabsTest();
 
-  await SpecialPowers.pushPrefEnv({
-    set: [["browser.preferences.experimental", true]],
-  });
-
   await BrowserTestUtils.openNewForegroundTab(
     gBrowser,
     "about:preferences#paneExperimental"
@@ -42,18 +38,14 @@ add_task(async function testNonPublicFeaturesShouldntGetDisplayed() {
   BrowserTestUtils.removeTab(gBrowser.selectedTab);
 
   await cleanup();
-  await SpecialPowers.popPrefEnv();
 });
 
 add_task(async function testNonPublicFeaturesShouldntGetDisplayed() {
   // Only recipes that do not match targeting or bucketing
   const cleanup = await setupLabsTest(DEFAULT_LABS_RECIPES.slice(2));
 
   await SpecialPowers.pushPrefEnv({
-    set: [
-      ["browser.preferences.experimental", true],
-      ["browser.preferences.experimental.hidden", false],
-    ],
+    set: [["browser.preferences.experimental.hidden", false]],
   });
 
   await BrowserTestUtils.openNewForegroundTab(

browser/components/preferences/tests/browser_experimental_features_studies_disabled.js

@@ -3,13 +3,20 @@
 
 "use strict";
 
-add_task(async function testHiddenWhenStudiesDisabled() {
+const { EnterprisePolicyTesting } = ChromeUtils.importESModule(
+  "resource://testing-common/EnterprisePolicyTesting.sys.mjs"
+);
+
+add_task(async function testHiddenWhenLabsDisabled() {
   const cleanup = await setupLabsTest();
   await SpecialPowers.pushPrefEnv({
-    set: [
-      ["browser.preferences.experimental", true],
-      ["browser.preferences.experimental.hidden", false],
-    ],
+    set: [["browser.preferences.experimental.hidden", false]],
+  });
+
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson({
+    policies: {
+      UserMessaging: { FirefoxLabs: false },
+    },
   });
 
   await BrowserTestUtils.openNewForegroundTab(
@@ -19,151 +26,27 @@ add_task(async function testHiddenWhenStudiesDisabled() {
 
   const doc = gBrowser.contentDocument;
 
-  await waitForExperimentalFeaturesShown(doc);
-
-  const enrollPromises = [
-    promiseNimbusStoreUpdate("nimbus-qa-1", true),
-    promiseNimbusStoreUpdate("nimbus-qa-2", true),
-  ];
-
-  await enrollByClick(doc.getElementById("nimbus-qa-1"), true);
-  await enrollByClick(doc.getElementById("nimbus-qa-2"), true);
-
-  await enrollPromises;
-
-  const unenrollPromises = [
-    promiseNimbusStoreUpdate("nimbus-qa-1", false),
-    promiseNimbusStoreUpdate("nimbus-qa-2", false),
-  ];
-
-  // Disabling studies should remove the experimental pane.
-  await SpecialPowers.pushPrefEnv({
-    set: [["app.shield.optoutstudies.enabled", false]],
-  });
-
-  await waitForExperimentalFeaturesHidden(doc);
-  await unenrollPromises;
-
-  ok(
-    !ExperimentAPI._manager.store.get("nimbus-qa-1")?.active,
-    "Should unenroll from nimbus-qa-1"
-  );
-  ok(
-    !ExperimentAPI._manager.store.get("nimbus-qa-2")?.active,
-    "Should unenroll from nimbus-qa-2"
+  await TestUtils.waitForCondition(
+    () => doc.getElementById("category-experimental").hidden,
+    "Wait for Experimental Features section label to become hidden"
   );
 
-  // Re-enabling studies should re-add it.
-  await SpecialPowers.popPrefEnv();
-  await waitForExperimentalFeaturesShown(doc);
-
-  // Navigate back to the experimental tab.
-  EventUtils.synthesizeMouseAtCenter(
-    doc.getElementById("category-experimental"),
-    {},
-    gBrowser.contentWindow
+  is(
+    doc.getElementById("pane-experimental-featureGates"),
+    null,
+    "Experimental Features section not added to the DOM"
   );
 
-  await waitForPageFlush();
-
   is(
     doc.querySelector(".category[selected]").id,
-    "category-experimental",
-    "Experimental category selected"
-  );
-
-  ok(
-    !doc.getElementById("nimbus-qa-1").checked,
-    "nimbus-qa-1 checkbox unchecked"
-  );
-  ok(
-    !doc.getElementById("nimbus-qa-2").checked,
-    "nimbus-qa-2 checkbox unchecked"
-  );
-
-  await enrollByClick(doc.getElementById("nimbus-qa-1"), true);
-  await enrollByClick(doc.getElementById("nimbus-qa-2"), true);
-
-  // Likewise, disabling telemetry should remove the experimental pane.
-  await SpecialPowers.pushPrefEnv({
-    set: [["datareporting.healthreport.uploadEnabled", false]],
-  });
-
-  await waitForExperimentalFeaturesHidden(doc);
-
-  ok(
-    !ExperimentAPI._manager.store.get("nimbus-qa-1")?.active,
-    "Should unenroll from nimbus-qa-1"
-  );
-  ok(
-    !ExperimentAPI._manager.store.get("nimbus-qa-2")?.active,
-    "Should unenroll from nimbus-qa-2"
-  );
-
-  await SpecialPowers.popPrefEnv();
-
-  // Re-enabling studies should re-add it.
-  await waitForExperimentalFeaturesShown(doc);
-
-  ok(
-    !doc.getElementById("nimbus-qa-1").checked,
-    "nimbus-qa-1 checkbox unchecked"
-  );
-  ok(
-    !doc.getElementById("nimbus-qa-2").checked,
-    "nimbus-qa-2 checkbox unchecked"
+    "category-general",
+    "When the experimental features section is hidden, navigating to #experimental should redirect to #general"
   );
 
   BrowserTestUtils.removeTab(gBrowser.selectedTab);
 
-  await cleanup();
   await SpecialPowers.popPrefEnv();
-});
-
-async function waitForExperimentalFeaturesShown(doc) {
-  await TestUtils.waitForCondition(
-    () => doc.querySelector(".featureGate"),
-    "Wait for features to be added to the DOM"
-  );
-
-  ok(
-    !doc.getElementById("category-experimental").hidden,
-    "Experimental Features section should not be hidden"
-  );
-
-  ok(
-    !Services.prefs.getBoolPref("browser.preferences.experimental.hidden"),
-    "Hidden pref should be false"
-  );
-}
-
-async function waitForExperimentalFeaturesHidden(doc) {
-  await TestUtils.waitForCondition(
-    () => doc.getElementById("category-experimental").hidden,
-    "Wait for Experimental Features section to get hidden"
-  );
-
-  ok(
-    doc.getElementById("category-experimental").hidden,
-    "Experimental Features section should be hidden when all features are hidden"
-  );
-  ok(
-    doc.getElementById("firefoxExperimentalCategory").hidden,
-    "Experimental Features header should be hidden when all features are hidden"
-  );
-  is(
-    doc.querySelector(".category[selected]").id,
-    "category-general",
-    "When the experimental features section is hidden, navigating to #experimental should redirect to #general"
-  );
-  ok(
-    Services.prefs.getBoolPref("browser.preferences.experimental.hidden"),
-    "Hidden pref should be true"
-  );
-}
+  await cleanup();
 
-function waitForPageFlush() {
-  return new Promise(resolve =>
-    requestAnimationFrame(() => requestAnimationFrame(resolve))
-  );
-}
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson({});
+});