Advanced Template Hints for Magento
http://fbrnc.net/blog/2012/10/magento-advanced-template-hints-20
Aoe_TemplateHints extends the default Magento "Template Hints" developer functionality by adding more information for each block:
To show the template hints simply add
?ath=1to the shop URL after installing this module. (And make sure the request IP is allowed in dev/restrict/allow_ips)
Please make sure to uninstall/deactivate the module before going live!
Install "Remote Call" plugin