ReferenceError: Uploader is not defined in magento 1.9.3
After lot of searching i found that magento 1.9.3.0 they remove the flash uploader so js file need to run uploader add these file in head
<reference name="head">
<action method="addJs"><file>lib/uploader/flow.min.js</file></action>
<action method="addJs"><file>lib/uploader/fusty-flow.js</file></action>
<action method="addJs"><file>lib/uploader/fusty-flow-factory.js</file></action>
<action method="addJs"><file>mage/adminhtml/uploader/instance.js</file></action>
</reference>