diff --git a/browser/base/content/test/Makefile.in b/browser/base/content/test/Makefile.in
index 5f3a2657bf3..6125ccc4154 100644
--- a/browser/base/content/test/Makefile.in
+++ b/browser/base/content/test/Makefile.in
@@ -318,6 +318,7 @@ _BROWSER_FILES = \
                  blockPluginVulnerableUpdatable.xml \
                  blockPluginVulnerableNoUpdate.xml \
                  blockNoPlugins.xml \
+                 blockPluginHard.xml \
                  browser_utilityOverlay.js \
                  browser_bug676619.js \
                  download_page.html \
diff --git a/browser/base/content/test/blockPluginHard.xml b/browser/base/content/test/blockPluginHard.xml
new file mode 100644
index 00000000000..24eb5bc6fc7
--- /dev/null
+++ b/browser/base/content/test/blockPluginHard.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<blocklist xmlns="http://www.mozilla.org/2006/addons-blocklist" lastupdate="1336406310000">
+  <emItems>
+  </emItems>
+  <pluginItems>
+    <pluginItem blockID="p9999">
+      <match name="filename" exp="libnptest\.so|nptest\.dll|Test\.plugin" />
+      <versionRange severity="2"></versionRange>
+    </pluginItem>
+  </pluginItems>
+</blocklist>
diff --git a/browser/base/content/test/browser_pluginnotification.js b/browser/base/content/test/browser_pluginnotification.js
index 9d574cbe1ff..85e772e8062 100644
--- a/browser/base/content/test/browser_pluginnotification.js
+++ b/browser/base/content/test/browser_pluginnotification.js
@@ -58,12 +58,16 @@ TabOpenListener.prototype = {
 
 function test() {
   waitForExplicitFinish();
+  requestLongerTimeout(2);
   registerCleanupFunction(function() {
+    Services.prefs.clearUserPref("extensions.blocklist.suppressUI");
     Services.prefs.clearUserPref("plugins.click_to_play");
     getTestPlugin().enabledState = Ci.nsIPluginTag.STATE_ENABLED;
     getTestPlugin("Second Test Plug-in").enabledState = Ci.nsIPluginTag.STATE_ENABLED;
   });
   Services.prefs.setBoolPref("plugins.click_to_play", false);
+  Services.prefs.setBoolPref("extensions.blocklist.suppressUI", true);
+
   var plugin = getTestPlugin();
   plugin.enabledState = Ci.nsIPluginTag.STATE_ENABLED;
 
@@ -117,7 +121,6 @@ function test1() {
   var plugin = getTestPlugin();
   ok(plugin, "Should have a test plugin");
   plugin.enabledState = Ci.nsIPluginTag.STATE_ENABLED;
-  plugin.blocklisted = false;
   prepareTest(test2, gTestRoot + "plugin_test.html");
 }
 
@@ -159,14 +162,19 @@ function test4(tab, win) {
 }
 
 function prepareTest5() {
+  info("prepareTest5");
   var plugin = getTestPlugin();
   plugin.enabledState = Ci.nsIPluginTag.STATE_ENABLED;
-  plugin.blocklisted = true;
-  prepareTest(test5, gTestRoot + "plugin_test.html");
+  setAndUpdateBlocklist(gHttpTestRoot + "blockPluginHard.xml",
+    function() {
+      info("prepareTest5 callback");
+      prepareTest(test5, gTestRoot + "plugin_test.html");
+  });
 }
 
 // Tests a page with a blocked plugin in it.
 function test5() {
+  info("test5");
   var notificationBox = gBrowser.getNotificationBox(gTestBrowser);
   ok(!PopupNotifications.getNotification("plugins-not-found", gTestBrowser), "Test 5, Should not have displayed the missing plugin notification");
   ok(notificationBox.getNotificationWithValue("blocked-plugins"), "Test 5, Should have displayed the blocked plugin notification");
@@ -204,11 +212,12 @@ function test7() {
 
   Services.prefs.setBoolPref("plugins.click_to_play", true);
   var plugin = getTestPlugin();
-  plugin.blocklisted = false;
   plugin.enabledState = Ci.nsIPluginTag.STATE_CLICKTOPLAY;
   getTestPlugin("Second Test Plug-in").enabledState = Ci.nsIPluginTag.STATE_CLICKTOPLAY;
 
-  prepareTest(test8, gTestRoot + "plugin_test.html");
+  setAndUpdateBlocklist(gHttpTestRoot + "blockNoPlugins.xml", function() {
+    prepareTest(test8, gTestRoot + "plugin_test.html");
+  });
 }
 
 // Tests a page with a working plugin that is click-to-play
@@ -533,7 +542,6 @@ function test14() {
 
   Services.prefs.setBoolPref("plugins.click_to_play", true);
   var plugin = getTestPlugin();
-  plugin.blocklisted = false;
   plugin.enabledState = Ci.nsIPluginTag.STATE_CLICKTOPLAY;
   getTestPlugin("Second Test Plug-in").enabledState = Ci.nsIPluginTag.STATE_CLICKTOPLAY;
   prepareTest(test15, gTestRoot + "plugin_alternate_content.html");
diff --git a/content/base/test/chrome/Makefile.in b/content/base/test/chrome/Makefile.in
index 630673116b3..f27b6eb378b 100644
--- a/content/base/test/chrome/Makefile.in
+++ b/content/base/test/chrome/Makefile.in
@@ -17,6 +17,8 @@ MOCHITEST_FILES = \
 MOCHITEST_CHROME_FILES = \
     test_bug206691.xul \
     test_bug391728.html \
+    blockPluginHard.xml \
+    blockNoPlugins.xml \
     file_bug391728.html \
     file_bug391728_2.html \
     test_bug421622.xul \
diff --git a/content/base/test/chrome/blockNoPlugins.xml b/content/base/test/chrome/blockNoPlugins.xml
new file mode 100644
index 00000000000..e4e191b3708
--- /dev/null
+++ b/content/base/test/chrome/blockNoPlugins.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0"?>
+<blocklist xmlns="http://www.mozilla.org/2006/addons-blocklist" lastupdate="1336406310001">
+  <emItems>
+  </emItems>
+  <pluginItems>
+  </pluginItems>
+</blocklist>
diff --git a/content/base/test/chrome/blockPluginHard.xml b/content/base/test/chrome/blockPluginHard.xml
new file mode 100644
index 00000000000..24eb5bc6fc7
--- /dev/null
+++ b/content/base/test/chrome/blockPluginHard.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<blocklist xmlns="http://www.mozilla.org/2006/addons-blocklist" lastupdate="1336406310000">
+  <emItems>
+  </emItems>
+  <pluginItems>
+    <pluginItem blockID="p9999">
+      <match name="filename" exp="libnptest\.so|nptest\.dll|Test\.plugin" />
+      <versionRange severity="2"></versionRange>
+    </pluginItem>
+  </pluginItems>
+</blocklist>
diff --git a/content/base/test/chrome/test_bug391728.html b/content/base/test/chrome/test_bug391728.html
index 9968b7acde2..ca35343a9b1 100644
--- a/content/base/test/chrome/test_bug391728.html
+++ b/content/base/test/chrome/test_bug391728.html
@@ -17,6 +17,10 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=391728
 </div>
 <pre id="test">
 <script class="testbody" type="text/javascript">
+const gHttpTestRoot = location.toString().replace("chrome://mochitests/content/", "http://127.0.0.1:8888/").split(/\//).slice(0, -1).join('/') + '/';
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+
 /** Test for Bug 391728 **/
 // Plugins that should dispatch error events and have the pseudo classes set
 const PLUGIN_COUNT = 11;
@@ -46,16 +50,39 @@ function plugin_binding_attached(event) {
 }
 
 function init_test() {
-  // Make sure the blocklist is off for the duration of this test
-  var prefs = Components.classes["@mozilla.org/preferences-service;1"]
-                        .getService(Components.interfaces.nsIPrefBranch);
-  prefs.setBoolPref("extensions.blocklist.enabled", false);
-
   if (!PluginUtils.withTestPlugin(start_test))
     SimpleTest.finish();
 }
 
+function updateBlocklist(aCallback) {
+  var blocklistNotifier = Components.classes["@mozilla.org/extensions/blocklist;1"]
+                          .getService(Components.interfaces.nsITimerCallback);
+  var observer = function() {
+    aCallback();
+    Services.obs.removeObserver(observer, "blocklist-updated");
+  };
+  Services.obs.addObserver(observer, "blocklist-updated", false);
+  blocklistNotifier.notify(null);
+}
+
+var _originalBlocklistURL = null;
+function setAndUpdateBlocklist(aURL, aCallback) {
+  info("Setting blocklist to " + aURL);
+  if (!_originalBlocklistURL) {
+    _originalBlocklistURL = Services.prefs.getCharPref("extensions.blocklist.url");
+  }
+  Services.prefs.setCharPref("extensions.blocklist.url", aURL);
+  updateBlocklist(aCallback);
+}
+
+function resetBlocklist() {
+  info("resetting blocklist URL to " + _originalBlocklistURL);
+  Services.prefs.setCharPref("extensions.blocklist.url", _originalBlocklistURL);
+}
+
 function start_test(plugin) {
+  Services.prefs.setBoolPref("extensions.blocklist.suppressUI", true);
+
   is(plugin.description, "Plug-in for testing purposes.\u2122 " +
                              "(\u0939\u093f\u0928\u094d\u0926\u0940 " +
                              "\u4e2d\u6587 " +
@@ -71,11 +98,9 @@ function start_test(plugin) {
 }
 
 function finish_test(plugin) {
+  Services.prefs.clearUserPref("extensions.blocklist.suppressUI");
+  resetBlocklist();
   plugin.enabledState = Components.interfaces.nsIPluginTag.STATE_ENABLED;
-  plugin.blocklisted = false;
-  var prefs = Components.classes["@mozilla.org/preferences-service;1"]
-                        .getService(Components.interfaces.nsIPrefBranch);
-  prefs.clearUserPref("extensions.blocklist.enabled");
   SimpleTest.finish();
 }
 
@@ -139,8 +164,11 @@ function test_disabled(plugin) {
   test_style("dotted");
   ok(plugin.disabled, "Plugin lost its disabled status");
   plugin.enabledState = Components.interfaces.nsIPluginTag.STATE_ENABLED;
-  plugin.blocklisted = true;
-  load_frame(test_blocked, "file_bug391728");
+
+  setAndUpdateBlocklist(gHttpTestRoot + "blockPluginHard.xml",
+    function() {
+      load_frame(test_blocked, "file_bug391728");
+    });
 }
 
 function test_blocked(plugin) {
@@ -159,7 +187,10 @@ function test_unknown(plugin) {
   is(gDisabled.length, 0, "Should not have been any disabled plugins");
   is(gBlocked.length, 0, "Should not have been any blocked plugins");
   test_style("none");
-  finish_test(plugin);
+  setAndUpdateBlocklist(gHttpTestRoot + "blockNoPlugins.xml", function() {
+    ok(!plugin.blocklisted, "Plugin shouldn't remain blocklisted");
+    finish_test(plugin);
+  });
 }
 
 SimpleTest.waitForExplicitFinish();
diff --git a/dom/plugins/base/nsIPluginTag.idl b/dom/plugins/base/nsIPluginTag.idl
index 8372adcdb80..9d24ffa569b 100644
--- a/dom/plugins/base/nsIPluginTag.idl
+++ b/dom/plugins/base/nsIPluginTag.idl
@@ -5,7 +5,7 @@
 
 #include "nsISupports.idl"
 
-[scriptable, uuid(00ea1f72-a57a-49bb-ac57-478902d9228b)]
+[scriptable, uuid(0354d96d-3fd3-4365-a0a2-6c807ec1ce95)]
 interface nsIPluginTag : nsISupports
 {
   // enabledState is stored as one of the following as an integer in prefs,
@@ -19,7 +19,12 @@ interface nsIPluginTag : nsISupports
   readonly attribute AUTF8String fullpath;
   readonly attribute AUTF8String version;
   readonly attribute AUTF8String name;
-           attribute boolean blocklisted;
+
+  /**
+   * true only if this plugin is "hardblocked" and cannot be enabled.
+   */
+  readonly attribute boolean blocklisted;
+
   readonly attribute boolean disabled;
   readonly attribute boolean clicktoplay;
            attribute unsigned long enabledState;
diff --git a/dom/plugins/base/nsPluginHost.cpp b/dom/plugins/base/nsPluginHost.cpp
index 0d5b7dbb335..9432a207c0c 100644
--- a/dom/plugins/base/nsPluginHost.cpp
+++ b/dom/plugins/base/nsPluginHost.cpp
@@ -1967,16 +1967,10 @@ nsresult nsPluginHost::ScanPluginsDirectory(nsIFile *pluginsDir,
                                                 EmptyString(), &state);
 
         if (NS_SUCCEEDED(rv)) {
-          // If the blocklist says so, block the plugin.
           // If the blocklist says it is risky and we have never seen this
           // plugin before, then disable it.
           // If the blocklist says this is an outdated plugin, warn about
           // outdated plugins.
-          // If the blocklist says the plugin is one of the click-to-play
-          // states, set the click-to-play flag.
-          if (state == nsIBlocklistService::STATE_BLOCKED) {
-             pluginTag->SetBlocklisted(true);
-          }
           if (state == nsIBlocklistService::STATE_SOFTBLOCKED && !seenBefore) {
              pluginTag->SetEnabledState(nsIPluginTag::STATE_DISABLED);
           }
diff --git a/dom/plugins/base/nsPluginTags.cpp b/dom/plugins/base/nsPluginTags.cpp
index 88e38412da9..ccf68aec7e5 100644
--- a/dom/plugins/base/nsPluginTags.cpp
+++ b/dom/plugins/base/nsPluginTags.cpp
@@ -11,6 +11,7 @@
 #include "nsServiceManagerUtils.h"
 #include "nsPluginsDir.h"
 #include "nsPluginHost.h"
+#include "nsIBlocklistService.h"
 #include "nsIUnicodeDecoder.h"
 #include "nsIPlatformCharset.h"
 #include "nsICharsetConverterManager.h"
@@ -30,7 +31,6 @@ using mozilla::TimeStamp;
 // no longer used                   0x0002    // reuse only if regenerating pluginreg.dat
 #define NS_PLUGIN_FLAG_FROMCACHE    0x0004    // this plugintag info was loaded from cache
 // no longer used                   0x0008    // reuse only if regenerating pluginreg.dat
-#define NS_PLUGIN_FLAG_BLOCKLISTED  0x0010    // this is a blocklisted plugin
 #define NS_PLUGIN_FLAG_CLICKTOPLAY  0x0020    // this is a click-to-play plugin
 
 inline char* new_str(const char* str)
@@ -63,12 +63,6 @@ GetStatePrefNameForPlugin(nsPluginTag* aTag)
   return MakePrefNameForPlugin("state", aTag);
 }
 
-static nsCString
-GetBlocklistedPrefNameForPlugin(nsPluginTag* aTag)
-{
-  return MakePrefNameForPlugin("blocklisted", aTag);
-}
-
 NS_IMPL_ISUPPORTS1(DOMMimeTypeImpl, nsIDOMMimeType)
 
 /* nsPluginTag */
@@ -332,7 +326,14 @@ nsPluginTag::GetDisabled(bool* aDisabled)
 bool
 nsPluginTag::IsBlocklisted()
 {
-  return Preferences::GetBool(GetBlocklistedPrefNameForPlugin(this).get(), false);
+  nsCOMPtr<nsIBlocklistService> bls = do_GetService("@mozilla.org/extensions/blocklist;1");
+  if (!bls) {
+    return false;
+  }
+
+  uint32_t state = nsIBlocklistService::STATE_NOT_BLOCKED;
+  bls->GetPluginBlocklistState(this, EmptyString(), EmptyString(), &state);
+  return state == nsIBlocklistService::STATE_BLOCKED;
 }
 
 NS_IMETHODIMP
@@ -342,26 +343,6 @@ nsPluginTag::GetBlocklisted(bool* aBlocklisted)
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsPluginTag::SetBlocklisted(bool blocklisted)
-{
-  if (blocklisted == IsBlocklisted()) {
-    return NS_OK;
-  }
-
-  const nsCString pref = GetBlocklistedPrefNameForPlugin(this);
-  if (blocklisted) {
-    Preferences::SetBool(pref.get(), true);
-  } else {
-    Preferences::ClearUser(pref.get());
-  }
-
-  if (nsRefPtr<nsPluginHost> host = nsPluginHost::GetInst()) {
-    host->UpdatePluginInfo(this);
-  }
-  return NS_OK;
-}
-
 bool
 nsPluginTag::IsClicktoplay()
 {
@@ -556,8 +537,4 @@ void nsPluginTag::ImportFlagsToPrefs(uint32_t flags)
   if (!(flags & NS_PLUGIN_FLAG_ENABLED)) {
     SetPluginState(ePluginState_Disabled);
   }
-
-  if (flags & NS_PLUGIN_FLAG_BLOCKLISTED) {
-    Preferences::SetBool(GetBlocklistedPrefNameForPlugin(this).get(), true);
-  }
 }
diff --git a/dom/plugins/test/unit/test_persist_in_prefs.js b/dom/plugins/test/unit/test_persist_in_prefs.js
index e3de5302439..bcef131a955 100644
--- a/dom/plugins/test/unit/test_persist_in_prefs.js
+++ b/dom/plugins/test/unit/test_persist_in_prefs.js
@@ -55,7 +55,6 @@ function run_test() {
   const pluginName = file.leafName.substring(0, file.leafName.length - suffix.length).toLowerCase();
   const pluginHost = Cc["@mozilla.org/plugin/host;1"].getService(Ci.nsIPluginHost);
   const statePref = "plugin.state." + pluginName;
-  const blocklistedPref = "plugin.blocklisted." + pluginName;
 
   // write plugin registry data
   let registry = "";
@@ -83,7 +82,6 @@ function run_test() {
 
   // check that the expected plugin state was loaded correctly from the registry
   do_check_true(plugin.disabled);
-  do_check_false(plugin.blocklisted);
   do_check_false(plugin.clicktoplay);
   // ... and imported into prefs, with 0 being the disabled state
   do_check_eq(0, Services.prefs.getIntPref(statePref));
diff --git a/toolkit/mozapps/extensions/nsBlocklistService.js b/toolkit/mozapps/extensions/nsBlocklistService.js
index 326be576e3b..4d1de8c3f12 100644
--- a/toolkit/mozapps/extensions/nsBlocklistService.js
+++ b/toolkit/mozapps/extensions/nsBlocklistService.js
@@ -31,6 +31,7 @@ const PREF_BLOCKLIST_INTERVAL         = "extensions.blocklist.interval";
 const PREF_BLOCKLIST_LEVEL            = "extensions.blocklist.level";
 const PREF_BLOCKLIST_PINGCOUNTTOTAL   = "extensions.blocklist.pingCountTotal";
 const PREF_BLOCKLIST_PINGCOUNTVERSION = "extensions.blocklist.pingCountVersion";
+const PREF_BLOCKLIST_SUPPRESSUI       = "extensions.blocklist.suppressUI";
 const PREF_PLUGINS_NOTIFYUSER         = "plugins.update.notifyUser";
 const PREF_GENERAL_USERAGENT_LOCALE   = "general.useragent.locale";
 const PREF_APP_DISTRIBUTION           = "distribution.id";
@@ -957,7 +958,7 @@ Blocklist.prototype = {
         if (state == oldState)
           continue;
 
-        if (plugin.blocklisted) {
+        if (oldState == Ci.nsIBlocklistService.STATE_BLOCKED) {
           if (state == Ci.nsIBlocklistService.STATE_SOFTBLOCKED)
             plugin.enabledState = Ci.nsIPluginTag.STATE_DISABLED;
         }
@@ -978,7 +979,6 @@ Blocklist.prototype = {
             });
           }
         }
-        plugin.blocklisted = state == Ci.nsIBlocklistService.STATE_BLOCKED;
       }
 
       if (addonList.length == 0) {
@@ -1027,7 +1027,12 @@ Blocklist.prototype = {
         Services.obs.removeObserver(applyBlocklistChanges, "addon-blocklist-closed");
       }
 
-      Services.obs.addObserver(applyBlocklistChanges, "addon-blocklist-closed", false)
+      Services.obs.addObserver(applyBlocklistChanges, "addon-blocklist-closed", false);
+
+      if (getPref("getBoolPref", PREF_BLOCKLIST_SUPPRESSUI, false)) {
+        applyBlocklistChanges();
+        return;
+      }
 
       function blocklistUnloadHandler(event) {
         if (event.target.location == URI_BLOCKLIST_DIALOG) {
diff --git a/toolkit/mozapps/extensions/test/browser/Makefile.in b/toolkit/mozapps/extensions/test/browser/Makefile.in
index 8206197ebc7..4d104cd6564 100644
--- a/toolkit/mozapps/extensions/test/browser/Makefile.in
+++ b/toolkit/mozapps/extensions/test/browser/Makefile.in
@@ -111,6 +111,8 @@ MOCHITEST_BROWSER_RESOURCES = \
   plugin_test.html \
   redirect.sjs \
   releaseNotes.xhtml \
+  blockNoPlugins.xml \
+  blockPluginHard.xml \
   $(NULL)
 
 MOCHITEST_BROWSER_FILES_PARTS = $(foreach s,MAIN SECONDARY RESOURCES,MOCHITEST_BROWSER_$(s))
diff --git a/toolkit/mozapps/extensions/test/browser/blockNoPlugins.xml b/toolkit/mozapps/extensions/test/browser/blockNoPlugins.xml
new file mode 100644
index 00000000000..e4e191b3708
--- /dev/null
+++ b/toolkit/mozapps/extensions/test/browser/blockNoPlugins.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0"?>
+<blocklist xmlns="http://www.mozilla.org/2006/addons-blocklist" lastupdate="1336406310001">
+  <emItems>
+  </emItems>
+  <pluginItems>
+  </pluginItems>
+</blocklist>
diff --git a/toolkit/mozapps/extensions/test/browser/blockPluginHard.xml b/toolkit/mozapps/extensions/test/browser/blockPluginHard.xml
new file mode 100644
index 00000000000..24eb5bc6fc7
--- /dev/null
+++ b/toolkit/mozapps/extensions/test/browser/blockPluginHard.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<blocklist xmlns="http://www.mozilla.org/2006/addons-blocklist" lastupdate="1336406310000">
+  <emItems>
+  </emItems>
+  <pluginItems>
+    <pluginItem blockID="p9999">
+      <match name="filename" exp="libnptest\.so|nptest\.dll|Test\.plugin" />
+      <versionRange severity="2"></versionRange>
+    </pluginItem>
+  </pluginItems>
+</blocklist>
diff --git a/toolkit/mozapps/extensions/test/browser/browser_CTP_plugins.js b/toolkit/mozapps/extensions/test/browser/browser_CTP_plugins.js
index 3052a053941..d4a114c4008 100644
--- a/toolkit/mozapps/extensions/test/browser/browser_CTP_plugins.js
+++ b/toolkit/mozapps/extensions/test/browser/browser_CTP_plugins.js
@@ -7,9 +7,34 @@ let gManagerWindow;
 let gTestPluginId;
 let gPluginBrowser;
 
+function updateBlocklist(aCallback) {
+  var blocklistNotifier = Cc["@mozilla.org/extensions/blocklist;1"]
+                          .getService(Ci.nsITimerCallback);
+  var observer = function() {
+    aCallback();
+    Services.obs.removeObserver(observer, "blocklist-updated");
+  };
+  Services.obs.addObserver(observer, "blocklist-updated", false);
+  blocklistNotifier.notify(null);
+}
+
+var _originalBlocklistURL = null;
+function setAndUpdateBlocklist(aURL, aCallback) {
+  if (!_originalBlocklistURL) {
+    _originalBlocklistURL = Services.prefs.getCharPref("extensions.blocklist.url");
+  }
+  Services.prefs.setCharPref("extensions.blocklist.url", aURL);
+  updateBlocklist(aCallback);
+}
+
+function resetBlocklist(aCallback) {
+  Services.prefs.setCharPref("extensions.blocklist.url", _originalBlocklistURL);
+}
+
 function test() {
   waitForExplicitFinish();
   Services.prefs.setBoolPref("plugins.click_to_play", true);
+  Services.prefs.setBoolPref("extensions.blocklist.suppressUI", true);
   let pluginTag = getTestPluginTag();
   pluginTag.enabledState = Ci.nsIPluginTag.STATE_CLICKTOPLAY;
   open_manager("addons://list/plugin", part1);
@@ -160,9 +185,13 @@ function part11() {
   gBrowser.removeCurrentTab();
 
   let pluginTag = getTestPluginTag();
-  pluginTag.blocklisted = true; // causes appDisabled to be set
-  close_manager(gManagerWindow, function() {
-    open_manager("addons://list/plugin", part12);
+
+// causes appDisabled to be set
+  setAndUpdateBlocklist(gHttpTestRoot + "blockPluginHard.xml",
+    function() {
+      close_manager(gManagerWindow, function() {
+      open_manager("addons://list/plugin", part12);
+    });
   });
 }
 
@@ -182,15 +211,17 @@ function part13() {
   let menu = gManagerWindow.document.getElementById("detail-state-menulist");
   is_element_hidden(menu, "part13: detail state menu should be hidden");
 
-  let pluginTag = getTestPluginTag();
-  pluginTag.blocklisted = false;
-  run_next_test();
+  setAndUpdateBlocklist(gHttpTestRoot + "blockNoPlugins.xml", function() {
+    run_next_test();
+  });
 }
 
 function end_test() {
   Services.prefs.clearUserPref("plugins.click_to_play");
+  Services.prefs.clearUserPref("extensions.blocklist.suppressUI");
   let pluginTag = getTestPluginTag();
   pluginTag.enabledState = Ci.nsIPluginTag.STATE_ENABLED;
+  resetBlocklist();
   close_manager(gManagerWindow, function() {
     finish();
   });
diff --git a/toolkit/mozapps/extensions/test/xpcshell/test_bug449027.js b/toolkit/mozapps/extensions/test/xpcshell/test_bug449027.js
index 607539830cb..a4532c2884e 100644
--- a/toolkit/mozapps/extensions/test/xpcshell/test_bug449027.js
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_bug449027.js
@@ -186,182 +186,48 @@ var ADDONS = [{
   toolkitBlocks: true
 }];
 
-var PLUGINS = [{
-  name: "test_bug449027_1",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: false,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_2",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_3",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_4",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: false,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_5",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: false,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_6",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_7",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_8",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_9",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_10",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_11",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_12",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_13",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_14",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: false,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_15",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}, {
-  name: "test_bug449027_16",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}, {
-  name: "test_bug449027_17",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: false,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_18",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: false,
-  toolkitBlocks: false
-}, {
-  name: "test_bug449027_19",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}, {
-  name: "test_bug449027_20",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}, {
-  name: "test_bug449027_21",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}, {
-  name: "test_bug449027_22",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}, {
-  name: "test_bug449027_23",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}, {
-  name: "test_bug449027_24",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}, {
-  name: "test_bug449027_25",
-  version: "5",
-  blocklisted: false,
-  start: false,
-  appBlocks: true,
-  toolkitBlocks: true
-}];
+function MockPluginTag(name, version, start, appBlocks, toolkitBlocks)
+{
+  this.name = name;
+  this.version = version;
+  this.start = start;
+  this.appBlocks = appBlocks;
+  this.toolkitBlocks = toolkitBlocks;
+}
+Object.defineProperty(MockPluginTag.prototype, "blocklisted", {
+  get: function MockPluginTag_getBlocklisted() {
+    let bls = AM_Cc["@mozilla.org/extensions/blocklist;1"].getService(Ci.nsIBlocklistService);
+    return bls.getPluginBlocklistState(this) == bls.STATE_BLOCKED;
+  }
+});
+
+var PLUGINS = [
+  new MockPluginTag("test_bug449027_1", "5", false, false, false),
+  new MockPluginTag("test_bug449027_2", "5", false, true, false),
+  new MockPluginTag("test_bug449027_3", "5", false, true, false),
+  new MockPluginTag("test_bug449027_4", "5", false, false, false),
+  new MockPluginTag("test_bug449027_5", "5", false, false, false),
+  new MockPluginTag("test_bug449027_6", "5", false, true, false),
+  new MockPluginTag("test_bug449027_7", "5", false, true, false),
+  new MockPluginTag("test_bug449027_8", "5", false, true, false),
+  new MockPluginTag("test_bug449027_9", "5", false, true, false),
+  new MockPluginTag("test_bug449027_10", "5", false, true, false),
+  new MockPluginTag("test_bug449027_11", "5", false, true, false),
+  new MockPluginTag("test_bug449027_12", "5", false, true, false),
+  new MockPluginTag("test_bug449027_13", "5", false, true, false),
+  new MockPluginTag("test_bug449027_14", "5", false, false, false),
+  new MockPluginTag("test_bug449027_15", "5", false, true, true),
+  new MockPluginTag("test_bug449027_16", "5", false, true, true),
+  new MockPluginTag("test_bug449027_17", "5", false, false, false),
+  new MockPluginTag("test_bug449027_18", "5", false, false, false),
+  new MockPluginTag("test_bug449027_19", "5", false, true, true),
+  new MockPluginTag("test_bug449027_20", "5", false, true, true),
+  new MockPluginTag("test_bug449027_21", "5", false, true, true),
+  new MockPluginTag("test_bug449027_22", "5", false, true, true),
+  new MockPluginTag("test_bug449027_23", "5", false, true, true),
+  new MockPluginTag("test_bug449027_24", "5", false, true, true),
+  new MockPluginTag("test_bug449027_25", "5", false, true, true)
+];
 
 var gCallback = null;
 var gTestserver = null;
diff --git a/toolkit/mozapps/extensions/test/xpcshell/test_bug455906.js b/toolkit/mozapps/extensions/test/xpcshell/test_bug455906.js
index 8d5c1c2003a..ac6be5f32b6 100644
--- a/toolkit/mozapps/extensions/test/xpcshell/test_bug455906.js
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_bug455906.js
@@ -71,49 +71,37 @@ var ADDONS = [{
   appVersion: "3"
 }];
 
-var PLUGINS = [{
+function MockPlugin(name, version, enabledState) {
+  this.name = name;
+  this.version = version;
+  this.enabledState = enabledState;
+}
+Object.defineProperty(MockPlugin.prototype, "blocklisted", {
+  get: function MockPlugin_getBlocklisted() {
+    let bls = Cc["@mozilla.org/extensions/blocklist;1"].getService(Ci.nsIBlocklistService);
+    return bls.getPluginBlocklistState(this) == bls.STATE_BLOCKED;
+  }
+});
+Object.defineProperty(MockPlugin.prototype, "disabled", {
+  get: function MockPlugin_getDisabled() {
+    return this.enabledState == Ci.nsIPluginTag.STATE_DISABLED;
+  }
+});
+
+var PLUGINS = [
   // Tests how the blocklist affects a disabled plugin
-  name: "test_bug455906_1",
-  version: "5",
-  enabledState : Ci.nsIPluginTag.STATE_DISABLED,
-  get disabled() this.enabledState == Ci.nsIPluginTag.STATE_DISABLED,
-  blocklisted: false
-}, {
+  new MockPlugin("test_bug455906_1", "5", Ci.nsIPluginTag.STATE_DISABLED),
   // Tests how the blocklist affects an enabled plugin
-  name: "test_bug455906_2",
-  version: "5",
-  enabledState: Ci.nsIPluginTag.STATE_ENABLED,
-  get disabled() this.enabledState == Ci.nsIPluginTag.STATE_DISABLED,
-  blocklisted: false
-}, {
+  new MockPlugin("test_bug455906_2", "5", Ci.nsIPluginTag.STATE_ENABLED),
   // Tests how the blocklist affects an enabled plugin, to be disabled by the notification
-  name: "test_bug455906_3",
-  version: "5",
-  enabledState: Ci.nsIPluginTag.STATE_ENABLED,
-  get disabled() this.enabledState == Ci.nsIPluginTag.STATE_DISABLED,
-  blocklisted: false
-}, {
+  new MockPlugin("test_bug455906_3", "5", Ci.nsIPluginTag.STATE_ENABLED),
   // Tests how the blocklist affects a disabled plugin that was already warned about
-  name: "test_bug455906_4",
-  version: "5",
-  enabledState: Ci.nsIPluginTag.STATE_DISABLED,
-  get disabled() this.enabledState == Ci.nsIPluginTag.STATE_DISABLED,
-  blocklisted: false
-}, {
+  new MockPlugin("test_bug455906_4", "5", Ci.nsIPluginTag.STATE_DISABLED),
   // Tests how the blocklist affects an enabled plugin that was already warned about
-  name: "test_bug455906_5",
-  version: "5",
-  enabledState: Ci.nsIPluginTag.STATE_ENABLED,
-  get disabled() this.enabledState == Ci.nsIPluginTag.STATE_DISABLED,
-  blocklisted: false
-}, {
+  new MockPlugin("test_bug455906_5", "5", Ci.nsIPluginTag.STATE_ENABLED),
   // Tests how the blocklist affects an already blocked plugin
-  name: "test_bug455906_6",
-  version: "5",
-  enabledState: Ci.nsIPluginTag.STATE_ENABLED,
-  get disabled() this.enabledState == Ci.nsIPluginTag.STATE_DISABLED,
-  blocklisted: true
-}];
+  new MockPlugin("test_bug455906_6", "5", Ci.nsIPluginTag.STATE_ENABLED)
+];
 
 var gNotificationCheck = null;
 var gTestCheck = null;