diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -8,7 +8,7 @@
 return array(
   'names' => array(
     'core.pkg.css' => '63e782fb',
-    'core.pkg.js' => '44aac665',
+    'core.pkg.js' => '408edfa5',
     'darkconsole.pkg.js' => '8ab24e01',
     'differential.pkg.css' => '8af45893',
     'differential.pkg.js' => 'dad3622f',
@@ -166,7 +166,7 @@
     'rsrc/externals/javelin/core/__tests__/install.js' => 'c432ee85',
     'rsrc/externals/javelin/core/__tests__/stratcom.js' => 'da194d4b',
     'rsrc/externals/javelin/core/__tests__/util.js' => 'd3b157a9',
-    'rsrc/externals/javelin/core/init.js' => 'b88ab49e',
+    'rsrc/externals/javelin/core/init.js' => 'b5b4929d',
     'rsrc/externals/javelin/core/init_node.js' => 'd7dde471',
     'rsrc/externals/javelin/core/install.js' => '1ffb3a9c',
     'rsrc/externals/javelin/core/util.js' => '90e3fde9',
@@ -193,6 +193,7 @@
     'rsrc/externals/javelin/lib/DOM.js' => 'c4569c05',
     'rsrc/externals/javelin/lib/History.js' => 'c60f4327',
     'rsrc/externals/javelin/lib/JSON.js' => '69adf288',
+    'rsrc/externals/javelin/lib/Leader.js' => '584afdb8',
     'rsrc/externals/javelin/lib/Mask.js' => '8a41885b',
     'rsrc/externals/javelin/lib/Request.js' => '97258e55',
     'rsrc/externals/javelin/lib/Resource.js' => '0f81f8df',
@@ -341,7 +342,7 @@
     'rsrc/image/texture/table_header_hover.png' => '038ec3b9',
     'rsrc/image/texture/table_header_tall.png' => 'd56b434f',
     'rsrc/js/application/aphlict/Aphlict.js' => '4a07e8e3',
-    'rsrc/js/application/aphlict/behavior-aphlict-dropdown.js' => 'f6bc26f0',
+    'rsrc/js/application/aphlict/behavior-aphlict-dropdown.js' => '4d27f9e3',
     'rsrc/js/application/aphlict/behavior-aphlict-listen.js' => 'a826c925',
     'rsrc/js/application/aphlict/behavior-aphlict-status.js' => '58f7803f',
     'rsrc/js/application/auth/behavior-persona-login.js' => '9414ff18',
@@ -536,7 +537,7 @@
     'inline-comment-summary-css' => '8cfd34e8',
     'javelin-aphlict' => '4a07e8e3',
     'javelin-behavior' => '61cbc29a',
-    'javelin-behavior-aphlict-dropdown' => 'f6bc26f0',
+    'javelin-behavior-aphlict-dropdown' => '4d27f9e3',
     'javelin-behavior-aphlict-listen' => 'a826c925',
     'javelin-behavior-aphlict-status' => '58f7803f',
     'javelin-behavior-aphront-basic-tokenizer' => 'b3a4b884',
@@ -658,7 +659,8 @@
     'javelin-history' => 'c60f4327',
     'javelin-install' => '1ffb3a9c',
     'javelin-json' => '69adf288',
-    'javelin-magical-init' => 'b88ab49e',
+    'javelin-leader' => '584afdb8',
+    'javelin-magical-init' => 'b5b4929d',
     'javelin-mask' => '8a41885b',
     'javelin-reactor' => '77b1cf6f',
     'javelin-reactor-dom' => 'b6d401d6',
@@ -1100,6 +1102,17 @@
       'javelin-install',
       'javelin-util',
     ),
+    '4d27f9e3' => array(
+      'javelin-behavior',
+      'javelin-request',
+      'javelin-stratcom',
+      'javelin-vector',
+      'javelin-dom',
+      'javelin-uri',
+      'javelin-behavior-device',
+      'phabricator-title',
+      'javelin-leader',
+    ),
     '4d94d9c3' => array(
       'javelin-behavior',
       'javelin-stratcom',
@@ -1150,6 +1163,9 @@
       'javelin-vector',
       'javelin-dom',
     ),
+    '584afdb8' => array(
+      'javelin-install',
+    ),
     '58f7803f' => array(
       'javelin-behavior',
       'javelin-aphlict',
@@ -1885,16 +1901,6 @@
       'javelin-util',
       'javelin-reactor',
     ),
-    'f6bc26f0' => array(
-      'javelin-behavior',
-      'javelin-request',
-      'javelin-stratcom',
-      'javelin-vector',
-      'javelin-dom',
-      'javelin-uri',
-      'javelin-behavior-device',
-      'phabricator-title',
-    ),
     'f7379f45' => array(
       'javelin-behavior',
       'javelin-dom',
diff --git a/webroot/rsrc/externals/javelin/lib/Leader.js b/webroot/rsrc/externals/javelin/lib/Leader.js
new file mode 100644
--- /dev/null
+++ b/webroot/rsrc/externals/javelin/lib/Leader.js
@@ -0,0 +1,72 @@
+/**
+ * @requires javelin-install
+ * @provides javelin-leader
+ * @javelin
+ */
+
+JX.install('Leader', {
+  statics: {
+    _interval: null,
+    _key: 'JX.Leader.id',
+
+    call: function(callback) {
+      if (!window.localStorage) {
+        callback();
+        return;
+      }
+
+      var self = JX.Leader;
+      if (!self._id) {
+        self._id = 1 + parseInt(Math.random() * 1000000000, 10);
+        JX.Stratcom.listen('pagehide', null, self._pagehide);
+      }
+
+
+      var lease = self._read();
+
+      // If the lease is good, we're all set.
+      var now = +new Date();
+      if (lease.until > now) {
+        if (lease.id === self._id) {
+          if (!self._interval && lease.until > now + 10000) {
+            self._interval = window.setInterval(self._write, 5000);
+          }
+
+          callback();
+        }
+        return;
+      }
+
+      self._write();
+
+      window.setTimeout(JX.bind(null, self.call, callback), 10);
+    },
+
+    _write: function() {
+      var self = JX.Leader;
+
+      var str = [self._id, ((+new Date()) + 16000)].join(':');
+      window.localStorage.setItem(self._key, str);
+    },
+
+    _read: function() {
+      var self = JX.Leader;
+
+      leader = window.localStorage.getItem(self._key) || '0:0';
+      leader = leader.split(':');
+
+      return {
+        id: parseInt(leader[0], 10),
+        until: parseInt(leader[1], 10)
+      };
+    },
+
+    _pagehide: function() {
+      var self = JX.Leader;
+      if (self._read().id === self._id) {
+        window.localStorage.removeItem(self._key);
+      }
+    }
+  }
+});
+
diff --git a/webroot/rsrc/js/application/aphlict/behavior-aphlict-dropdown.js b/webroot/rsrc/js/application/aphlict/behavior-aphlict-dropdown.js
--- a/webroot/rsrc/js/application/aphlict/behavior-aphlict-dropdown.js
+++ b/webroot/rsrc/js/application/aphlict/behavior-aphlict-dropdown.js
@@ -8,6 +8,7 @@
  *           javelin-uri
  *           javelin-behavior-device
  *           phabricator-title
+ *           javelin-leader
  */
 
 JX.behavior('aphlict-dropdown', function(config, statics) {