diff --git a/core/modules/user/src/Form/UserPermissionsForm.php b/core/modules/user/src/Form/UserPermissionsForm.php
index 9a1df99..4f5b8ef 100644
--- a/core/modules/user/src/Form/UserPermissionsForm.php
+++ b/core/modules/user/src/Form/UserPermissionsForm.php
@@ -140,7 +140,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
         $options[$perm] = $perm_item['title'];
         $form['permissions'][$perm]['description'] = array(
           '#type' => 'inline_template',
-          '#template' => '<div class="permission"><span class="title">{{ title }}</span>{% if description or warning %}<div class="description">{% if warning %}<em class="permission-warning">{{ warning }}</em> {% endif %}{{ description }}</div>{% endif %}</div>',
+          '#template' => '<div class="permission"><span class="title table-filter-text-source">{{ title }}</span>{% if description or warning %}<div class="description">{% if warning %}<em class="permission-warning">{{ warning }}</em> {% endif %}{{ description }}</div>{% endif %}</div>',
           '#context' => array(
             'title' => $perm_item['title'],
           ),
diff --git a/core/modules/user/user.permissions.js b/core/modules/user/user.permissions.js
index 415fc53..7d71cf6 100644
--- a/core/modules/user/user.permissions.js
+++ b/core/modules/user/user.permissions.js
@@ -49,6 +49,55 @@
         // Re-insert the table into the DOM.
         $ancestor[method]($table);
       });
+
+      var $input = $('input.table-filter-text').once('table-filter-text');
+      var $table = $($input.attr('data-table'));
+      var $rowsAndDetails, $rows, $details;
+      var searching = false;
+
+      function filterPermissionList(e) {
+        var query = $(e.target).val().toLowerCase();
+
+        function showPermissionRow(index, row) {
+          var $row = $(row);
+          var $sources = $row.find('.table-filter-text-source');
+          var textMatch = $sources.text().toLowerCase().indexOf(query) !== -1;
+          $row.closest('tr').toggle(textMatch);
+        }
+        // Search over all rows and packages.
+        $rowsAndDetails.show();
+
+        // Filter if the length of the query is at least 2 characters.
+        if (query.length >= 2) {
+          searching = true;
+          $rows.each(showPermissionRow);
+
+          // Note that we first open all <details> to be able to use ':visible'.
+          // Mark the <details> elements that were closed before filtering, so
+          // they can be reclosed when filtering is removed.
+          $details.not('[open]').attr('data-drupal-system-state', 'forced-open');
+
+          // Hide the package <details> if they don't have any visible rows.
+          // Note that we first show() all <details> to be able to use ':visible'.
+          $details.attr('open', true).each(hidePackageDetails);
+        }
+        else if (searching) {
+          searching = false;
+          $rowsAndDetails.show();
+          // Return <details> elements that had been closed before filtering
+          // to a closed state.
+          $details.filter('[data-drupal-system-state="forced-open"]')
+            .removeAttr('data-drupal-system-state')
+            .attr('open', false);
+        }
+      }
+
+      if ($table.length) {
+        $rowsAndDetails = $table.find('tr, details');
+        $rows = $table.find('tbody tr');
+        $details = $rowsAndDetails.filter('.package-listing');
+        $input.on('keyup', filterPermissionList);
+      }
     },
 
     /**