--- a/browser/base/content/test/plugins/browser_CTP_notificationBar.js
+++ b/browser/base/content/test/plugins/browser_CTP_notificationBar.js
@@ -1,33 +1,34 @@
 var rootDir = getRootDirectory(gTestPath);
 const gTestRoot = rootDir.replace("chrome://mochitests/content/", "http://127.0.0.1:8888/");
 var gTestBrowser = null;
 
 add_task(async function() {
+  await SpecialPowers.pushPrefEnv({ set: [
+    ["plugins.show_infobar", true],
+    ["plugins.click_to_play", true],
+    ["extensions.blocklist.supressUI", true],
+  ]});
+
   registerCleanupFunction(function() {
     clearAllPluginPermissions();
     setTestPluginEnabledState(Ci.nsIPluginTag.STATE_ENABLED, "Test Plug-in");
     setTestPluginEnabledState(Ci.nsIPluginTag.STATE_ENABLED, "Second Test Plug-in");
-    Services.prefs.clearUserPref("plugins.click_to_play");
-    Services.prefs.clearUserPref("extensions.blocklist.suppressUI");
     gBrowser.removeCurrentTab();
     window.focus();
     gTestBrowser = null;
   });
 
-  Services.prefs.setBoolPref("extensions.blocklist.suppressUI", true);
-
   let newTab = BrowserTestUtils.addTab(gBrowser);
   gBrowser.selectedTab = newTab;
   gTestBrowser = gBrowser.selectedBrowser;
 });
 
 add_task(async function() {
-  Services.prefs.setBoolPref("plugins.click_to_play", true);
   setTestPluginEnabledState(Ci.nsIPluginTag.STATE_CLICKTOPLAY, "Test Plug-in");
 
   await promiseTabLoadEvent(gBrowser.selectedTab, gTestRoot + "plugin_small.html");
 
   // Work around for delayed PluginBindingAttached
   await promiseUpdatePluginBindings(gTestBrowser);
 
   await promisePopupNotification("click-to-play-plugins");

--- a/browser/base/content/test/plugins/browser_CTP_remove_navigate.js
+++ b/browser/base/content/test/plugins/browser_CTP_remove_navigate.js
@@ -1,25 +1,26 @@
 const gTestRoot = getRootDirectory(gTestPath);
 const gHttpTestRoot = gTestRoot.replace("chrome://mochitests/content/",
                                         "http://127.0.0.1:8888/");
 
 add_task(async function() {
+  await SpecialPowers.pushPrefEnv({ set: [
+    ["plugins.click_to_play", true],
+    ["extensions.blocklist.suppressUI", true],
+    ["plugins.show_infobar", true],
+  ]});
   registerCleanupFunction(function() {
     clearAllPluginPermissions();
     setTestPluginEnabledState(Ci.nsIPluginTag.STATE_ENABLED, "Test Plug-in");
     setTestPluginEnabledState(Ci.nsIPluginTag.STATE_ENABLED, "Second Test Plug-in");
-    Services.prefs.clearUserPref("plugins.click_to_play");
-    Services.prefs.clearUserPref("extensions.blocklist.suppressUI");
     gBrowser.removeCurrentTab();
     window.focus();
   });
 
-  Services.prefs.setBoolPref("plugins.click_to_play", true);
-  Services.prefs.setBoolPref("extensions.blocklist.suppressUI", true);
   setTestPluginEnabledState(Ci.nsIPluginTag.STATE_CLICKTOPLAY, "Test Plug-in");
   setTestPluginEnabledState(Ci.nsIPluginTag.STATE_CLICKTOPLAY, "Second Test Plug-in");
 });
 
 /**
  * Tests that if a plugin is removed just as we transition to
  * a different page, that we don't show the hidden plugin
  * notification bar on the new page.

--- a/browser/base/content/test/plugins/browser_iterate_hidden_plugins.js
+++ b/browser/base/content/test/plugins/browser_iterate_hidden_plugins.js
@@ -16,18 +16,21 @@ add_task(async function setup() {
   let originalPluginState = getTestPluginEnabledState();
   setTestPluginEnabledState(Ci.nsIPluginTag.STATE_CLICKTOPLAY);
   registerCleanupFunction(() => {
     setTestPluginEnabledState(originalPluginState);
   });
 
   // And then make the plugin hidden.
   await SpecialPowers.pushPrefEnv({
-    set: [[HIDDEN_CTP_PLUGIN_PREF, TEST_PLUGIN_NAME]],
-  })
+    set: [
+      [HIDDEN_CTP_PLUGIN_PREF, TEST_PLUGIN_NAME],
+      ["plugins.show_infobar", true],
+    ],
+  });
 });
 
 /**
  * Tests that if a plugin is click-to-play and in the
  * HIDDEN_CTP_PLUGIN_PREF list, then it shouldn't be visible
  * when iterating navigator.plugins.
  */
 add_task(async function test_plugin_is_hidden_on_iteration() {