To show the category IDs in the category tree under Catalog->Categories->Manage Categories you can rewrite Mage_Adminhtml_Block_Catalog_Category_Tree in an own module. You have to rewrite the method buildNodeName like this: /** * Get category name * * @param Varien_Object $node * @return string */ public function buildNodeName($node) { $result = $this->escapeHtml($node->getName()); if ($this->_withProductCount) { $result .= ‘ (‘ . $node->getProductCount() […]