diff --git a/app/code/Magento/Newsletter/Block/Adminhtml/Problem.php b/app/code/Magento/Newsletter/Block/Adminhtml/Problem.php
index c5f4dc68d4dd2..61a17d7ad5e51 100644
--- a/app/code/Magento/Newsletter/Block/Adminhtml/Problem.php
+++ b/app/code/Magento/Newsletter/Block/Adminhtml/Problem.php
@@ -19,7 +19,7 @@ class Problem extends \Magento\Backend\Block\Template
     /**
      * @var string
      */
-    protected $_template = 'problem/list.phtml';
+    protected $_template = 'Magento_Newsletter::problem/list.phtml';
 
     /**
      * @var \Magento\Newsletter\Model\ResourceModel\Problem\Collection
diff --git a/app/code/Magento/Newsletter/Block/Adminhtml/Queue/Edit.php b/app/code/Magento/Newsletter/Block/Adminhtml/Queue/Edit.php
index f085b0f6c9c8b..ca90b5d84a10f 100644
--- a/app/code/Magento/Newsletter/Block/Adminhtml/Queue/Edit.php
+++ b/app/code/Magento/Newsletter/Block/Adminhtml/Queue/Edit.php
@@ -19,7 +19,7 @@ class Edit extends \Magento\Backend\Block\Template
     /**
      * @var string
      */
-    protected $_template = 'queue/edit.phtml';
+    protected $_template = 'Magento_Newsletter::queue/edit.phtml';
 
     /**
      * Core registry
diff --git a/app/code/Magento/Newsletter/Block/Adminhtml/Subscriber.php b/app/code/Magento/Newsletter/Block/Adminhtml/Subscriber.php
index 86e7e7ee4756d..4d5165db68736 100644
--- a/app/code/Magento/Newsletter/Block/Adminhtml/Subscriber.php
+++ b/app/code/Magento/Newsletter/Block/Adminhtml/Subscriber.php
@@ -29,7 +29,7 @@ class Subscriber extends \Magento\Backend\Block\Template
     /**
      * @var string
      */
-    protected $_template = 'subscriber/list.phtml';
+    protected $_template = 'Magento_Newsletter::subscriber/list.phtml';
 
     /**
      * @var \Magento\Newsletter\Model\ResourceModel\Queue\CollectionFactory
diff --git a/app/code/Magento/Newsletter/Block/Adminhtml/Template.php b/app/code/Magento/Newsletter/Block/Adminhtml/Template.php
index 02b60e049f254..92ae6e6c3db04 100644
--- a/app/code/Magento/Newsletter/Block/Adminhtml/Template.php
+++ b/app/code/Magento/Newsletter/Block/Adminhtml/Template.php
@@ -16,7 +16,7 @@ class Template extends \Magento\Backend\Block\Template
     /**
      * @var string
      */
-    protected $_template = 'template/list.phtml';
+    protected $_template = 'Magento_Newsletter::template/list.phtml';
 
     /**
      * @return $this
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Product/Viewed.php b/app/code/Magento/Reports/Block/Adminhtml/Product/Viewed.php
index fc4cffbdca408..f901b32d8b12f 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Product/Viewed.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Product/Viewed.php
@@ -17,7 +17,7 @@ class Viewed extends \Magento\Backend\Block\Widget\Grid\Container
     /**
      * @var string
      */
-    protected $_template = 'report/grid/container.phtml';
+    protected $_template = 'Magento_Reports::report/grid/container.phtml';
 
     /**
      * @return void
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Sales/Bestsellers.php b/app/code/Magento/Reports/Block/Adminhtml/Sales/Bestsellers.php
index d70930d2395ae..b773184408a7f 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Sales/Bestsellers.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Sales/Bestsellers.php
@@ -19,7 +19,7 @@ class Bestsellers extends \Magento\Backend\Block\Widget\Grid\Container
      *
      * @var string
      */
-    protected $_template = 'report/grid/container.phtml';
+    protected $_template = 'Magento_Reports::report/grid/container.phtml';
 
     /**
      * {@inheritdoc}
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Sales/Coupons.php b/app/code/Magento/Reports/Block/Adminhtml/Sales/Coupons.php
index b8f71158877bb..fe85af58b34f6 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Sales/Coupons.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Sales/Coupons.php
@@ -19,7 +19,7 @@ class Coupons extends \Magento\Backend\Block\Widget\Grid\Container
      *
      * @var string
      */
-    protected $_template = 'report/grid/container.phtml';
+    protected $_template = 'Magento_Reports::report/grid/container.phtml';
 
     /**
      * {@inheritdoc}
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Sales/Invoiced.php b/app/code/Magento/Reports/Block/Adminhtml/Sales/Invoiced.php
index c96483e33ebe5..57594a11bd997 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Sales/Invoiced.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Sales/Invoiced.php
@@ -19,7 +19,7 @@ class Invoiced extends \Magento\Backend\Block\Widget\Grid\Container
      *
      * @var string
      */
-    protected $_template = 'report/grid/container.phtml';
+    protected $_template = 'Magento_Reports::report/grid/container.phtml';
 
     /**
      * {@inheritdoc}
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Sales/Refunded.php b/app/code/Magento/Reports/Block/Adminhtml/Sales/Refunded.php
index 7ff80f62f6bee..994b29e6eb0dd 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Sales/Refunded.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Sales/Refunded.php
@@ -19,7 +19,7 @@ class Refunded extends \Magento\Backend\Block\Widget\Grid\Container
      *
      * @var string
      */
-    protected $_template = 'report/grid/container.phtml';
+    protected $_template = 'Magento_Reports::report/grid/container.phtml';
 
     /**
      * {@inheritdoc}
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Sales/Sales.php b/app/code/Magento/Reports/Block/Adminhtml/Sales/Sales.php
index 5abea45e657d7..64375ace3e94d 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Sales/Sales.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Sales/Sales.php
@@ -19,7 +19,7 @@ class Sales extends \Magento\Backend\Block\Widget\Grid\Container
      *
      * @var string
      */
-    protected $_template = 'report/grid/container.phtml';
+    protected $_template = 'Magento_Reports::report/grid/container.phtml';
 
     /**
      * {@inheritdoc}
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Sales/Shipping.php b/app/code/Magento/Reports/Block/Adminhtml/Sales/Shipping.php
index 44dd4521c7bbe..e4dbdc2737745 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Sales/Shipping.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Sales/Shipping.php
@@ -19,7 +19,7 @@ class Shipping extends \Magento\Backend\Block\Widget\Grid\Container
      *
      * @var string
      */
-    protected $_template = 'report/grid/container.phtml';
+    protected $_template = 'Magento_Reports::report/grid/container.phtml';
 
     /**
      * {@inheritdoc}
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Sales/Tax.php b/app/code/Magento/Reports/Block/Adminhtml/Sales/Tax.php
index 38de08314d257..fa9e63745a87d 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Sales/Tax.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Sales/Tax.php
@@ -19,7 +19,7 @@ class Tax extends \Magento\Backend\Block\Widget\Grid\Container
      *
      * @var string
      */
-    protected $_template = 'report/grid/container.phtml';
+    protected $_template = 'Magento_Reports::report/grid/container.phtml';
 
     /**
      * {@inheritdoc}
diff --git a/app/code/Magento/Reports/Block/Adminhtml/Wishlist.php b/app/code/Magento/Reports/Block/Adminhtml/Wishlist.php
index 28f2011de3365..1ca76cb1cf95f 100644
--- a/app/code/Magento/Reports/Block/Adminhtml/Wishlist.php
+++ b/app/code/Magento/Reports/Block/Adminhtml/Wishlist.php
@@ -18,7 +18,7 @@ class Wishlist extends \Magento\Backend\Block\Template
      *
      * @var string
      */
-    protected $_template = 'report/wishlist.phtml';
+    protected $_template = 'Magento_Reports::report/wishlist.phtml';
 
     /**
      * Reports wishlist collection factory
diff --git a/app/code/Magento/Review/Block/Adminhtml/Rating/Edit/Tab/Form.php b/app/code/Magento/Review/Block/Adminhtml/Rating/Edit/Tab/Form.php
index 0841388252905..dbf0a79bc42ff 100644
--- a/app/code/Magento/Review/Block/Adminhtml/Rating/Edit/Tab/Form.php
+++ b/app/code/Magento/Review/Block/Adminhtml/Rating/Edit/Tab/Form.php
@@ -17,7 +17,7 @@ class Form extends \Magento\Backend\Block\Widget\Form\Generic
     /**
      * @var string
      */
-    protected $_template = 'rating/form.phtml';
+    protected $_template = 'Magento_Review::rating/form.phtml';
 
     /**
      * Session
diff --git a/app/code/Magento/Review/Block/Adminhtml/Rss/Grid/Link.php b/app/code/Magento/Review/Block/Adminhtml/Rss/Grid/Link.php
index 5d2ec9fc186ca..def0e896fc95f 100644
--- a/app/code/Magento/Review/Block/Adminhtml/Rss/Grid/Link.php
+++ b/app/code/Magento/Review/Block/Adminhtml/Rss/Grid/Link.php
@@ -16,7 +16,7 @@ class Link extends \Magento\Framework\View\Element\Template
     /**
      * @var string
      */
-    protected $_template = 'rss/grid/link.phtml';
+    protected $_template = 'Magento_Review::rss/grid/link.phtml';
 
     /**
      * @var \Magento\Framework\App\Rss\UrlBuilderInterface
diff --git a/app/code/Magento/Review/Block/Customer/Recent.php b/app/code/Magento/Review/Block/Customer/Recent.php
index 8f593f5695812..5c7f1ec2c0dad 100644
--- a/app/code/Magento/Review/Block/Customer/Recent.php
+++ b/app/code/Magento/Review/Block/Customer/Recent.php
@@ -20,7 +20,7 @@ class Recent extends \Magento\Framework\View\Element\Template
      *
      * @var string
      */
-    protected $_template = 'customer/list.phtml';
+    protected $_template = 'Magento_Review::customer/list.phtml';
 
     /**
      * Product reviews collection
diff --git a/app/code/Magento/Review/Block/Customer/View.php b/app/code/Magento/Review/Block/Customer/View.php
index b7dfd4b969a9d..237b972f16573 100644
--- a/app/code/Magento/Review/Block/Customer/View.php
+++ b/app/code/Magento/Review/Block/Customer/View.php
@@ -23,7 +23,7 @@ class View extends \Magento\Catalog\Block\Product\AbstractProduct
      *
      * @var string
      */
-    protected $_template = 'customer/view.phtml';
+    protected $_template = 'Magento_Review::customer/view.phtml';
 
     /**
      * Catalog product model
diff --git a/app/code/Magento/Review/Block/Rating/Entity/Detailed.php b/app/code/Magento/Review/Block/Rating/Entity/Detailed.php
index de871d9061428..0ce4f436ae704 100644
--- a/app/code/Magento/Review/Block/Rating/Entity/Detailed.php
+++ b/app/code/Magento/Review/Block/Rating/Entity/Detailed.php
@@ -15,7 +15,7 @@ class Detailed extends \Magento\Framework\View\Element\Template
     /**
      * @var string
      */
-    protected $_template = 'detailed.phtml';
+    protected $_template = 'Magento_Review::detailed.phtml';
 
     /**
      * @var \Magento\Review\Model\RatingFactory
diff --git a/app/code/Magento/Review/Block/View.php b/app/code/Magento/Review/Block/View.php
index e2d0355671688..95b7176b48c44 100644
--- a/app/code/Magento/Review/Block/View.php
+++ b/app/code/Magento/Review/Block/View.php
@@ -19,7 +19,7 @@ class View extends \Magento\Catalog\Block\Product\AbstractProduct
      *
      * @var string
      */
-    protected $_template = 'view.phtml';
+    protected $_template = 'Magento_Review::view.phtml';
 
     /**
      * Rating option model
diff --git a/app/code/Magento/Tax/Block/Adminhtml/Rate/Form.php b/app/code/Magento/Tax/Block/Adminhtml/Rate/Form.php
index 96fc9a40d53d1..450203486f364 100644
--- a/app/code/Magento/Tax/Block/Adminhtml/Rate/Form.php
+++ b/app/code/Magento/Tax/Block/Adminhtml/Rate/Form.php
@@ -31,7 +31,7 @@ class Form extends \Magento\Backend\Block\Widget\Form\Generic
     /**
      * @var string
      */
-    protected $_template = 'rate/form.phtml';
+    protected $_template = 'Magento_Tax::rate/form.phtml';
 
     /**
      * Tax data
diff --git a/app/code/Magento/Tax/Block/Adminhtml/Rate/Title.php b/app/code/Magento/Tax/Block/Adminhtml/Rate/Title.php
index e1e866c06571b..9612b57f8d5d8 100644
--- a/app/code/Magento/Tax/Block/Adminhtml/Rate/Title.php
+++ b/app/code/Magento/Tax/Block/Adminhtml/Rate/Title.php
@@ -23,7 +23,7 @@ class Title extends \Magento\Framework\View\Element\Template
     /**
      * @var string
      */
-    protected $_template = 'rate/title.phtml';
+    protected $_template = 'Magento_Tax::rate/title.phtml';
 
     /**
      * @var \Magento\Store\Model\StoreFactory
diff --git a/app/code/Magento/Tax/Block/Adminhtml/Rate/Toolbar/Add.php b/app/code/Magento/Tax/Block/Adminhtml/Rate/Toolbar/Add.php
index 9cf96bc21e962..16d828542c5b9 100644
--- a/app/code/Magento/Tax/Block/Adminhtml/Rate/Toolbar/Add.php
+++ b/app/code/Magento/Tax/Block/Adminhtml/Rate/Toolbar/Add.php
@@ -20,7 +20,7 @@ class Add extends \Magento\Backend\Block\Template implements \Magento\Backend\Bl
     /**
      * @var string
      */
-    protected $_template = 'toolbar/rate/add.phtml';
+    protected $_template = 'Magento_Tax::toolbar/rate/add.phtml';
 
     /**
      * @var \Magento\Backend\Block\Widget\Button\ButtonList
diff --git a/app/code/Magento/Tax/Block/Adminhtml/Rate/Toolbar/Save.php b/app/code/Magento/Tax/Block/Adminhtml/Rate/Toolbar/Save.php
index 19c5fab72ac4b..4eaaa3be8a8f2 100644
--- a/app/code/Magento/Tax/Block/Adminhtml/Rate/Toolbar/Save.php
+++ b/app/code/Magento/Tax/Block/Adminhtml/Rate/Toolbar/Save.php
@@ -16,7 +16,7 @@ class Save extends \Magento\Backend\Block\Template implements \Magento\Backend\B
     /**
      * @var string
      */
-    protected $_template = 'toolbar/rate/save.phtml';
+    protected $_template = 'Magento_Tax::toolbar/rate/save.phtml';
 
     /**
      * @var \Magento\Backend\Block\Widget\Button\ButtonList
diff --git a/app/code/Magento/Tax/Block/Checkout/Grandtotal.php b/app/code/Magento/Tax/Block/Checkout/Grandtotal.php
index 68de4cb24a487..77af1ad99ea2c 100644
--- a/app/code/Magento/Tax/Block/Checkout/Grandtotal.php
+++ b/app/code/Magento/Tax/Block/Checkout/Grandtotal.php
@@ -15,7 +15,7 @@ class Grandtotal extends \Magento\Checkout\Block\Total\DefaultTotal
      *
      * @var string
      */
-    protected $_template = 'checkout/grandtotal.phtml';
+    protected $_template = 'Magento_Tax::checkout/grandtotal.phtml';
 
     /**
      * @var \Magento\Tax\Model\Config
diff --git a/app/code/Magento/Tax/Block/Checkout/Shipping.php b/app/code/Magento/Tax/Block/Checkout/Shipping.php
index e9098035053be..299c586fd224c 100644
--- a/app/code/Magento/Tax/Block/Checkout/Shipping.php
+++ b/app/code/Magento/Tax/Block/Checkout/Shipping.php
@@ -15,7 +15,7 @@ class Shipping extends \Magento\Checkout\Block\Total\DefaultTotal
      *
      * @var string
      */
-    protected $_template = 'checkout/shipping.phtml';
+    protected $_template = 'Magento_Tax::checkout/shipping.phtml';
 
     /**
      * @var \Magento\Tax\Model\Config
diff --git a/app/code/Magento/Tax/Block/Checkout/Subtotal.php b/app/code/Magento/Tax/Block/Checkout/Subtotal.php
index 7a9059df08bab..22da07954159d 100644
--- a/app/code/Magento/Tax/Block/Checkout/Subtotal.php
+++ b/app/code/Magento/Tax/Block/Checkout/Subtotal.php
@@ -15,7 +15,7 @@ class Subtotal extends \Magento\Checkout\Block\Total\DefaultTotal
      *
      * @var string
      */
-    protected $_template = 'checkout/subtotal.phtml';
+    protected $_template = 'Magento_Tax::checkout/subtotal.phtml';
 
     /**
      * @var \Magento\Tax\Model\Config
diff --git a/app/code/Magento/Tax/Block/Checkout/Tax.php b/app/code/Magento/Tax/Block/Checkout/Tax.php
index f741e64019de1..0a86c0312ab1c 100644
--- a/app/code/Magento/Tax/Block/Checkout/Tax.php
+++ b/app/code/Magento/Tax/Block/Checkout/Tax.php
@@ -14,5 +14,5 @@ class Tax extends \Magento\Checkout\Block\Total\DefaultTotal
     /**
      * @var string
      */
-    protected $_template = 'checkout/tax.phtml';
+    protected $_template = 'Magento_Tax::checkout/tax.phtml';
 }
diff --git a/app/code/Magento/TaxImportExport/Block/Adminhtml/Rate/ImportExport.php b/app/code/Magento/TaxImportExport/Block/Adminhtml/Rate/ImportExport.php
index a42877b3ecf8a..ab64567f4fe28 100644
--- a/app/code/Magento/TaxImportExport/Block/Adminhtml/Rate/ImportExport.php
+++ b/app/code/Magento/TaxImportExport/Block/Adminhtml/Rate/ImportExport.php
@@ -14,7 +14,7 @@ class ImportExport extends \Magento\Backend\Block\Widget
     /**
      * @var string
      */
-    protected $_template = 'importExport.phtml';
+    protected $_template = 'Magento_TaxImportExport::importExport.phtml';
 
     /**
      * @param \Magento\Backend\Block\Template\Context $context
diff --git a/app/code/Magento/TaxImportExport/Block/Adminhtml/Rate/ImportExportHeader.php b/app/code/Magento/TaxImportExport/Block/Adminhtml/Rate/ImportExportHeader.php
index 8897e9b2083e9..e223adc3adb1a 100644
--- a/app/code/Magento/TaxImportExport/Block/Adminhtml/Rate/ImportExportHeader.php
+++ b/app/code/Magento/TaxImportExport/Block/Adminhtml/Rate/ImportExportHeader.php
@@ -16,5 +16,5 @@ class ImportExportHeader extends \Magento\Backend\Block\Widget
      *
      * @var string
      */
-    protected $_template = 'importExportHeader.phtml';
+    protected $_template = 'Magento_TaxImportExport::importExportHeader.phtml';
 }
diff --git a/app/code/Magento/Theme/Block/Adminhtml/Wysiwyg/Files/Content/Uploader.php b/app/code/Magento/Theme/Block/Adminhtml/Wysiwyg/Files/Content/Uploader.php
index 8e7f4c9cc680c..e99500dbd0694 100644
--- a/app/code/Magento/Theme/Block/Adminhtml/Wysiwyg/Files/Content/Uploader.php
+++ b/app/code/Magento/Theme/Block/Adminhtml/Wysiwyg/Files/Content/Uploader.php
@@ -19,7 +19,7 @@ class Uploader extends \Magento\Backend\Block\Media\Uploader
      *
      * @var string
      */
-    protected $_template = 'browser/content/uploader.phtml';
+    protected $_template = 'Magento_Theme::browser/content/uploader.phtml';
 
     /**
      * @var \Magento\Theme\Helper\Storage
diff --git a/app/code/Magento/Theme/Block/Html/Breadcrumbs.php b/app/code/Magento/Theme/Block/Html/Breadcrumbs.php
index c1f8ea620ef41..cff87fc8726bd 100644
--- a/app/code/Magento/Theme/Block/Html/Breadcrumbs.php
+++ b/app/code/Magento/Theme/Block/Html/Breadcrumbs.php
@@ -21,7 +21,7 @@ class Breadcrumbs extends \Magento\Framework\View\Element\Template
      *
      * @var string
      */
-    protected $_template = 'html/breadcrumbs.phtml';
+    protected $_template = 'Magento_Theme::html/breadcrumbs.phtml';
 
     /**
      * List of available breadcrumb properties
diff --git a/app/code/Magento/Theme/Block/Html/Header.php b/app/code/Magento/Theme/Block/Html/Header.php
index f597b4034da92..2663a4da15011 100644
--- a/app/code/Magento/Theme/Block/Html/Header.php
+++ b/app/code/Magento/Theme/Block/Html/Header.php
@@ -19,7 +19,7 @@ class Header extends \Magento\Framework\View\Element\Template
      *
      * @var string
      */
-    protected $_template = 'html/header.phtml';
+    protected $_template = 'Magento_Theme::html/header.phtml';
 
     /**
      * Retrieve welcome text
diff --git a/app/code/Magento/Theme/Block/Html/Header/Logo.php b/app/code/Magento/Theme/Block/Html/Header/Logo.php
index 5b0c2eaf04c45..0a0e71f44ba32 100644
--- a/app/code/Magento/Theme/Block/Html/Header/Logo.php
+++ b/app/code/Magento/Theme/Block/Html/Header/Logo.php
@@ -19,7 +19,7 @@ class Logo extends \Magento\Framework\View\Element\Template
      *
      * @var string
      */
-    protected $_template = 'html/header/logo.phtml';
+    protected $_template = 'Magento_Theme::html/header/logo.phtml';
 
     /**
      * @var \Magento\MediaStorage\Helper\File\Storage\Database