diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index 0838618cd96e..c200f510e1f3 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -14,8 +14,6 @@
 
 pref("toolkit.defaultChromeURI", "chrome://geckoview/content/geckoview.xhtml", locked);
 
-pref("toolkit.zoomManager.zoomValues", ".2,.3,.5,.67,.8,.9,1,1.1,1.2,1.33,1.5,1.7,2,2.4,3,4");
-
 // Show/Hide scrollbars when active/inactive
 pref("ui.useOverlayScrollbars", 1);
 pref("ui.scrollbarFadeBeginDelay", 450);
@@ -96,7 +94,6 @@ pref("extensions.update.enabled", true);
 pref("extensions.update.interval", 86400);
 pref("extensions.logging.enabled", false);
 pref("extensions.strictCompatibility", false);
-pref("extensions.minCompatibleAppVersion", "11.0");
 
 pref("extensions.update.url", "https://versioncheck.addons.mozilla.org/update/VersionCheck.php?reqVersion=%REQ_VERSION%&id=%ITEM_ID%&version=%ITEM_VERSION%&maxAppVersion=%ITEM_MAXAPPVERSION%&status=%ITEM_STATUS%&appID=%APP_ID%&appVersion=%APP_VERSION%&appOS=%APP_OS%&appABI=%APP_ABI%&locale=%APP_LOCALE%&currentAppVersion=%CURRENT_APP_VERSION%&updateType=%UPDATE_TYPE%&compatMode=%COMPATIBILITY_MODE%");
 pref("extensions.update.background.url", "https://versioncheck-bg.addons.mozilla.org/update/VersionCheck.php?reqVersion=%REQ_VERSION%&id=%ITEM_ID%&version=%ITEM_VERSION%&maxAppVersion=%ITEM_MAXAPPVERSION%&status=%ITEM_STATUS%&appID=%APP_ID%&appVersion=%APP_VERSION%&appOS=%APP_OS%&appABI=%APP_ABI%&locale=%APP_LOCALE%&currentAppVersion=%CURRENT_APP_VERSION%&updateType=%UPDATE_TYPE%&compatMode=%COMPATIBILITY_MODE%");
@@ -173,11 +170,6 @@ pref("devtools.debugger.unix-domain-socket", "@ANDROID_PACKAGE_NAME@/firefox-deb
 pref("breakpad.reportURL", "https://crash-stats.mozilla.org/report/index/");
 
 pref("app.support.baseURL", "https://support.mozilla.org/1/mobile/%VERSION%/%OS%/%LOCALE%/");
-#if MOZ_UPDATE_CHANNEL == beta
-  pref("app.releaseNotesURL", "https://www.mozilla.com/%LOCALE%/mobile/%VERSION%beta/releasenotes/");
-#else
-  pref("app.releaseNotesURL", "https://www.mozilla.com/%LOCALE%/mobile/%VERSION%/releasenotes/");
-#endif
 
 /* prefs used by the update timer system (including blocklist pings) */
 pref("app.update.timerFirstInterval", 30000); // milliseconds
@@ -267,20 +259,6 @@ pref("dom.meta-viewport.enabled", true);
 // Enable GMP support in the addon manager.
 pref("media.gmp-provider.enabled", true);
 
-// The default color scheme in reader mode (light, dark, auto)
-// auto = color automatically adjusts according to ambient light level
-// (auto only works on platforms where the 'devicelight' event is enabled)
-// auto doesn't work: https://bugzilla.mozilla.org/show_bug.cgi?id=1472957
-// pref("reader.color_scheme", "auto");
-pref("reader.color_scheme", "light");
-
-// Color scheme values available in reader mode UI.
-// pref("reader.color_scheme.values", "[\"dark\",\"auto\",\"light\"]");
-pref("reader.color_scheme.values", "[\"dark\",\"sepia\",\"light\"]");
-
-// Whether to use a vertical or horizontal toolbar.
-pref("reader.toolbar.vertical", false);
-
 // Telemetry settings.
 // Whether to use the unified telemetry behavior, requires a restart.
 pref("toolkit.telemetry.unified", false);
diff --git a/services/sync/tests/unit/test_addons_store.js b/services/sync/tests/unit/test_addons_store.js
index 68b8fdce5681..a0a3ac6c69ac 100644
--- a/services/sync/tests/unit/test_addons_store.js
+++ b/services/sync/tests/unit/test_addons_store.js
@@ -40,8 +40,6 @@ AddonTestUtils.createAppInfo(
 );
 AddonTestUtils.overrideCertDB();
 
-Services.prefs.setCharPref("extensions.minCompatibleAppVersion", "0");
-Services.prefs.setCharPref("extensions.minCompatiblePlatformVersion", "0");
 Services.prefs.setBoolPref("extensions.experiments.enabled", true);
 
 const SYSTEM_ADDON_ID = "system1@tests.mozilla.org";
diff --git a/services/sync/tests/unit/test_addons_tracker.js b/services/sync/tests/unit/test_addons_tracker.js
index 8fbf9cc86191..f8473e4cfa29 100644
--- a/services/sync/tests/unit/test_addons_tracker.js
+++ b/services/sync/tests/unit/test_addons_tracker.js
@@ -19,8 +19,6 @@ AddonTestUtils.createAppInfo(
 );
 AddonTestUtils.overrideCertDB();
 
-Services.prefs.setCharPref("extensions.minCompatibleAppVersion", "0");
-Services.prefs.setCharPref("extensions.minCompatiblePlatformVersion", "0");
 Services.prefs.setBoolPref("extensions.experiments.enabled", true);
 
 Svc.PrefBranch.setBoolPref("engine.addons", true);