diff --git a/src/aphront/AphrontRequest.php b/src/aphront/AphrontRequest.php
--- a/src/aphront/AphrontRequest.php
+++ b/src/aphront/AphrontRequest.php
@@ -383,6 +383,15 @@
     return $this->validateCSRF();
   }
 
+  public function hasCSRF() {
+    try {
+      $this->validateCSRF();
+      return true;
+    } catch (AphrontMalformedRequestException $ex) {
+      return false;
+    }
+  }
+
   public function isFormOrHisecPost() {
     $post = $this->getExists(self::TYPE_FORM) &&
             $this->isHTTPPost();
diff --git a/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelTabsController.php b/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelTabsController.php
--- a/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelTabsController.php
+++ b/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelTabsController.php
@@ -140,7 +140,7 @@
       case 'remove':
         return $this->handleRemoveOperation($panel, $target, $cancel_uri);
       case 'move':
-        break;
+        return $this->handleMoveOperation($panel, $target, $after, $cancel_uri);
       case 'rename':
         return $this->handleRenameOperation($panel, $target, $cancel_uri);
     }
@@ -298,6 +298,89 @@
       ->addSubmitButton(pht('Rename Tab'));
   }
 
+  private function handleMoveOperation(
+    PhabricatorDashboardPanel $panel,
+    $target,
+    $after,
+    $cancel_uri) {
+    $request = $this->getRequest();
+    $viewer = $this->getViewer();
+
+    $move = $request->getStr('move');
+
+    $impl = $panel->getImplementation();
+    $old_config = $impl->getPanelConfiguration($panel);
+
+    $is_next = ($move === 'next');
+    if ($target === $after) {
+      return $this->newDialog()
+        ->setTitle(pht('Impossible!'))
+        ->appendParagraph(
+          pht(
+            'You can not move a tab relative to itself.'))
+        ->addCancelButton($cancel_uri);
+    } else if ($is_next && ((string)last_key($old_config) === $target)) {
+      return $this->newDialog()
+        ->setTitle(pht('Impossible!'))
+        ->appendParagraph(
+          pht(
+            'This is already the last tab. It can not move any farther to '.
+            'the right.'))
+        ->addCancelButton($cancel_uri);
+    } else if ((string)head_key($old_config) === $target) {
+      return $this->newDialog()
+        ->setTitle(pht('Impossible!'))
+        ->appendParagraph(
+          pht(
+            'This is already the first tab. It can not move any farther to '.
+            'the left.'))
+        ->addCancelButton($cancel_uri);
+    }
+
+    if ($request->hasCSRF()) {
+      $new_config = array();
+      foreach ($old_config as $old_key => $old_spec) {
+        $old_key = (string)$old_key;
+
+        $is_after = ($old_key === $after);
+
+        if (!$is_after) {
+          if ($old_key === $target) {
+            continue;
+          }
+        }
+
+        if ($is_after && !$is_next) {
+          $new_config[$target] = $old_config[$target];
+        }
+
+        $new_config[$old_key] = $old_spec;
+
+        if ($is_after && $is_next) {
+          $new_config[$target] = $old_config[$target];
+        }
+      }
+
+      $this->writePanelConfig($panel, $new_config);
+
+      return id(new AphrontRedirectResponse())->setURI($cancel_uri);
+    }
+
+    if ($is_next) {
+      $prompt = pht('Move this tab to the right?');
+    } else {
+      $prompt = pht('Move this tab to the left?');
+    }
+
+    return $this->newEditDialog()
+      ->setTitle(pht('Move Tab'))
+      ->addHiddenInput('target', $target)
+      ->addHiddenInput('after', $after)
+      ->addHiddenInput('move', $move)
+      ->appendParagraph($prompt)
+      ->addCancelButton($cancel_uri)
+      ->addSubmitButton(pht('Move Tab'));
+  }
 
   private function writePanelConfig(
     PhabricatorDashboardPanel $panel,
diff --git a/src/applications/dashboard/paneltype/PhabricatorDashboardTabsPanelType.php b/src/applications/dashboard/paneltype/PhabricatorDashboardTabsPanelType.php
--- a/src/applications/dashboard/paneltype/PhabricatorDashboardTabsPanelType.php
+++ b/src/applications/dashboard/paneltype/PhabricatorDashboardTabsPanelType.php
@@ -87,7 +87,15 @@
 
     $selected = 0;
 
-    $last_idx = null;
+    $key_list = array_keys($config);
+
+    $next_keys = array();
+    $prev_keys = array();
+    for ($ii = 0; $ii < count($key_list); $ii++) {
+      $next_keys[$key_list[$ii]] = idx($key_list, $ii + 1);
+      $prev_keys[$key_list[$ii]] = idx($key_list, $ii - 1);
+    }
+
     foreach ($config as $idx => $tab_spec) {
       $panel_id = idx($tab_spec, 'panelID');
       $subpanel = idx($panels, $panel_id);
@@ -145,6 +153,42 @@
             ->setHref($rename_tab_uri)
             ->setWorkflow(true));
 
+        $move_uri = urisprintf('/dashboard/panel/tabs/%d/move/', $id);
+
+        $prev_key = $prev_keys[$idx];
+        $prev_params = array(
+          'target' => $idx,
+          'after' => $prev_key,
+          'move' => 'prev',
+          'contextPHID' => $context_phid,
+        );
+        $prev_uri = new PhutilURI($move_uri, $prev_params);
+
+        $next_key = $next_keys[$idx];
+        $next_params = array(
+          'target' => $idx,
+          'after' => $next_key,
+          'move' => 'next',
+          'contextPHID' => $context_phid,
+        );
+        $next_uri = new PhutilURI($move_uri, $next_params);
+
+        $dropdown_menu->addAction(
+          id(new PhabricatorActionView())
+            ->setName(pht('Move Tab Left'))
+            ->setIcon('fa-chevron-left')
+            ->setHref($prev_uri)
+            ->setWorkflow(true)
+            ->setDisabled(($prev_key === null) || !$can_edit));
+
+        $dropdown_menu->addAction(
+          id(new PhabricatorActionView())
+            ->setName(pht('Move Tab Right'))
+            ->setIcon('fa-chevron-right')
+            ->setHref($next_uri)
+            ->setWorkflow(true)
+            ->setDisabled(($next_key === null) || !$can_edit));
+
         $dropdown_menu->addAction(
           id(new PhabricatorActionView())
             ->setName(pht('Remove Tab'))
@@ -177,15 +221,16 @@
       }
 
       $list->addMenuItem($tab_view);
-
-      $last_idx = $idx;
     }
 
+
     if ($is_edit) {
       $actions = id(new PhabricatorActionListView())
         ->setViewer($viewer);
 
       $add_last_uri = clone $add_uri;
+
+      $last_idx = last_key($config);
       if ($last_idx) {
         $add_last_uri->replaceQueryParam('after', $last_idx);
       }
diff --git a/src/applications/notification/controller/PhabricatorNotificationClearController.php b/src/applications/notification/controller/PhabricatorNotificationClearController.php
--- a/src/applications/notification/controller/PhabricatorNotificationClearController.php
+++ b/src/applications/notification/controller/PhabricatorNotificationClearController.php
@@ -10,12 +10,7 @@
     if ($request->isDialogFormPost()) {
       $should_clear = true;
     } else {
-      try {
-        $request->validateCSRF();
-        $should_clear = true;
-      } catch (AphrontMalformedRequestException $ex) {
-        $should_clear = false;
-      }
+      $should_clear = $request->hasCSRF();
     }
 
     if ($should_clear) {