diff --git a/Model/Controller/ResultPlugin.php b/Model/Controller/ResultPlugin.php
index 648bf2c..f68c667 100644
--- a/Model/Controller/ResultPlugin.php
+++ b/Model/Controller/ResultPlugin.php
@@ -80,6 +80,19 @@ public function aroundRenderResult(
             return $result;
         }
 
+        $ignoredStrings = $this->scopeConfig->getValue(
+            'mfrocketjavascript/general/ignore_deferred_javascript_with',
+            \Magento\Store\Model\ScopeInterface::SCOPE_STORE);
+        $ignoredStrings = explode("\n", str_replace("\r", "\n", $ignoredStrings));
+        foreach ($ignoredStrings as $key => $ignoredString) {
+            $ignoredString = trim($ignoredString);
+            if (!$ignoredString) {
+                unset($ignoredStrings[$key]);
+            } else {
+                $ignoredStrings[$key] = $ignoredString;
+            }
+        }
+
         $html = $response->getBody();
         $scripts = [];
 
@@ -107,6 +120,13 @@ public function aroundRenderResult(
                 continue;
             }
 
+            foreach ($ignoredStrings as $ignoredString) {
+                if (false !== stripos($script, $ignoredString)) {
+                    $start++;
+                    continue 2;
+                }
+            }
+
             $html = str_replace($script, '', $html);
             $scripts[] = $script;
         }
diff --git a/etc/adminhtml/system.xml b/etc/adminhtml/system.xml
index 6127396..a2d2b26 100644
--- a/etc/adminhtml/system.xml
+++ b/etc/adminhtml/system.xml
@@ -39,6 +39,13 @@
                     </depends>
                     <comment>Enter page patches each in a new line. "*" means any path, you can use it at the beginning or end.</comment>
                 </field>
+                <field id="ignore_deferred_javascript_with" showInDefault="1" showInStore="1" showInWebsite="1" sortOrder="30" translate="label" type="textarea" canRestore="1">
+                    <label>Ignore Deferred JavaScript With</label>
+                    <depends>
+                        <field id="enable_deferred_javascript">1</field>
+                    </depends>
+                    <comment><![CDATA[Enter ignored strings, each in a new line. JavaScript that contains these strings will not be moved to the bottom of the page. Scripts that contain <strong>data-rocketjavascript="false"</strong> will automatically be ignored. Example &lt;script data-rocketjavascript="false"&gt;/* some script *&lt;/script&gt;]]></comment>
+                </field>
                 <field id="enable_js_bundling_optimization" showInDefault="1" showInStore="1" showInWebsite="1" sortOrder="30" translate="label" type="select" canRestore="1">
                     <label>Enable JavaScript Bundling Optimization</label>
                     <comment>Please note that this option only works with enabled JavaScript Bundling (Configuration > Advanced > Developer > JavaScript Settings > Enable JavaScript Bundling).</comment>
diff --git a/etc/config.xml b/etc/config.xml
index c6836dc..56f71fd 100644
--- a/etc/config.xml
+++ b/etc/config.xml
@@ -17,6 +17,7 @@
                 <disallowed_pages_for_deferred_js>checkout/*
 onestepcheckout/*
                 </disallowed_pages_for_deferred_js>
+                <ignore_deferred_javascript_with>www.googletagmanager.com</ignore_deferred_javascript_with>
                 <enable_js_bundling_optimization>1</enable_js_bundling_optimization>
                 <included_in_bundling>jquery.min.js
 mage/common.min.js