diff --git a/app/assets/javascripts/mailjet.js b/app/assets/javascripts/mailjet.js
deleted file mode 100644
index 42ba7b513..000000000
--- a/app/assets/javascripts/mailjet.js
+++ /dev/null
@@ -1,132 +0,0 @@
-if (typeof wScriptAlreadyLoaded === "undefined") {
-  var wScriptAlreadyLoaded = true;
-
-  // Array of popin translations
-  var i8nMessages = [];
-  i8nMessages['en_US'] = [];
-  i8nMessages['fr_FR'] = [];
-  i8nMessages['de_DE'] = [];
-  i8nMessages['es_ES'] = [];
-  i8nMessages['en_US']['iframe-error'] = 'Your browser does not support the IFrame element';
-  i8nMessages['en_US']['close-popin'] = 'Close';
-  i8nMessages['fr_FR']['iframe-error'] = 'Votre navigateur ne supporte pas l\'élément iframe';
-  i8nMessages['fr_FR']['close-popin'] = 'Fermer';
-  i8nMessages['de_DE']['iframe-error'] = 'Ihr navigator verträgt kein Element iframe';
-  i8nMessages['de_DE']['close-popin'] = 'Schließen';
-  i8nMessages['es_ES']['iframe-error'] = 'Su navegante no soporta el elemento iframe';
-  i8nMessages['es_ES']['close-popin'] = 'Cerrarse';
-
-  window.onload = function() {
-      // Display popin when click event occure on widget button
-      Array.prototype.forEach.call(document.getElementsByClassName("mj-w-btn"), function(btnNode) {
-          btnNode.style.cursor = "pointer";
-          btnNode.addEventListener("click", function(event) {
-              mjOpenPopin(event, this);
-          });
-      });
-
-     mjOpenPopin = function(event, element) {
-          event.preventDefault();
-          //event.stopPropagation();
-
-          //var token = str.substring(btnNode.id.lastIndexOf("-") + 1, btnNode.id.length - btnNode.id.lastIndexOf("-"));
-          var token = element.getAttribute("data-token");
-
-          //Register parameters
-          var widgetPopinData = document.querySelector(".mj-w-data[data-token='" + token + "']");
-          if (widgetPopinData) {
-            var apiKey = widgetPopinData.getAttribute("data-apikey");
-            var wId = widgetPopinData.getAttribute("data-w-id");
-            var locale = widgetPopinData.getAttribute("data-lang");
-            var base = widgetPopinData.getAttribute("data-base");
-            var width = widgetPopinData.getAttribute("data-width");
-            var height = widgetPopinData.getAttribute("data-height");
-            var statics = widgetPopinData.getAttribute("data-statics");
-
-            // Call to Mailjet CSS file
-            var cssFile = document.createElement("link");
-            cssFile.setAttribute("rel", "stylesheet");
-            cssFile.setAttribute("type", "text/css");
-            if (statics) {
-                base += "/" + statics;
-            }
-            cssFile.setAttribute("href", base + "/css/w-popin-less.css");
-            document.getElementsByTagName("head")[0].appendChild(cssFile);
-
-            var htmlCode = "<div id=\"mj-w-overlay\" style=\"display: none;\">" +
-            "<div id=\"mj-w-popin-block\" style=\"max-width:" + width + "px; max-height:" + height + "px\">" +
-            "<div id=\"mj-w-loader\"></div>" +
-            "<img id=\"mj-w-close-img\" alt=\"" + i8nMessages[locale]['close-popin'] + "\" title=\"" + i8nMessages[locale]['close-popin'] + "\" src=\"" + base + "/images/w-popin-close.png\" style=\"display:none;\" />" +
-            "<iframe id=\"mj-w-iframe\" src=\"" + base + "/widget/iframe/" + apiKey + "/" + wId + "\" scrolling=\"no\" width=\"100% \"   frameborder=\"0\" allotransparency=\"true\" style=\"background-color:transparent; border-radius:3px;height: 0px;\">" +
-            "<p>" + i8nMessages[locale]['iframe-error'] + "</p>" +
-            "</iframe>" +
-            "</div>" +
-            "</div>";
-
-            widgetPopinData.innerHTML = htmlCode;
-
-            document.getElementById("mj-w-iframe").onload = function() {
-
-                document.getElementById("mj-w-iframe").style.height= height + "px";
-                document.getElementById('mj-w-close-img').style.display = "block";
-                document.getElementById("mj-w-loader").style.display = "none";
-                document.getElementById("mj-w-popin-block").style.border = "none";
-                if (window.matchMedia("(max-width: 767px)").matches) {
-                    document.getElementById("mj-w-iframe").style.width = '100%';
-                    document.getElementById("mj-w-popin-block").style.height = 'auto';
-                    document.getElementById("mj-w-popin-block").style.width = '90%';
-                }
-            };
-
-            var closeImgNode = document.getElementById("mj-w-close-img");
-            closeImgNode.addEventListener("click", function(event) {
-                closePopin();
-                event.preventDefault();
-            });
-
-            document.addEventListener("keydown", escapeEvent);
-            document.getElementById("mj-w-iframe").onclick=function(event){
-                event.stopPropagation();
-            };
-            //document.addEventListener("click");
-
-            document.getElementById("mj-w-overlay").style.display = "block";
-            document.getElementById("mj-w-overlay").addEventListener("click", function(event){
-                closePopin();
-                event.preventDefault();
-            });
-          }
-      }
-
-      // Escape event : close popin
-      function escapeEvent(e) {
-          if (e.keyCode == 27) { // Escape key
-              closePopin();
-          }
-      }
-
-      // Close popin (remove popin HTML code)
-      function closePopin() {
-          var rootContainer = document.getElementById("mj-w-overlay");
-          if(rootContainer) {
-              rootContainer.parentNode.removeChild(rootContainer);
-          }
-          document.removeEventListener("keypress", escapeEvent);
-      }
-
-      window.onresize = function(event) {
-          if (window.matchMedia("(max-width: 767px)").matches) {
-              var popin = document.getElementById("mj-w-popin-block");
-              var iframe = document.getElementById("mj-w-iframe");
-              if (popin) {
-                  popin.style.height = 'auto';
-                  popin.style.width = '90%';
-              }
-              if (iframe) {
-                  iframe.style.width = '100%';
-              }
-          }
-      }
-
-  };
-}
diff --git a/app/javascript/packs/mailjet.js b/app/javascript/packs/mailjet.js
new file mode 100644
index 000000000..30b85a446
--- /dev/null
+++ b/app/javascript/packs/mailjet.js
@@ -0,0 +1,159 @@
+// This file is copied from mailjet. We serve here a copy of it ourselves
+// to avoid loading javascript files from other domains on the frontpage.
+
+// Array of popin translations
+const i8nMessages = [];
+i8nMessages['en_US'] = [];
+i8nMessages['fr_FR'] = [];
+i8nMessages['de_DE'] = [];
+i8nMessages['es_ES'] = [];
+i8nMessages['en_US']['iframe-error'] =
+  'Your browser does not support the IFrame element';
+i8nMessages['en_US']['close-popin'] = 'Close';
+i8nMessages['fr_FR']['iframe-error'] =
+  "Votre navigateur ne supporte pas l'élément iframe";
+i8nMessages['fr_FR']['close-popin'] = 'Fermer';
+i8nMessages['de_DE']['iframe-error'] =
+  'Ihr navigator verträgt kein Element iframe';
+i8nMessages['de_DE']['close-popin'] = 'Schließen';
+i8nMessages['es_ES']['iframe-error'] =
+  'Su navegante no soporta el elemento iframe';
+i8nMessages['es_ES']['close-popin'] = 'Cerrarse';
+
+function mjOpenPopin(event, element) {
+  event.preventDefault();
+  //event.stopPropagation();
+
+  //var token = str.substring(btnNode.id.lastIndexOf("-") + 1, btnNode.id.length - btnNode.id.lastIndexOf("-"));
+  var token = element.getAttribute('data-token');
+
+  //Register parameters
+  var widgetPopinData = document.querySelector(
+    ".mj-w-data[data-token='" + token + "']"
+  );
+  if (widgetPopinData) {
+    var apiKey = widgetPopinData.getAttribute('data-apikey');
+    var wId = widgetPopinData.getAttribute('data-w-id');
+    var locale = widgetPopinData.getAttribute('data-lang');
+    var base = widgetPopinData.getAttribute('data-base');
+    var width = widgetPopinData.getAttribute('data-width');
+    var height = widgetPopinData.getAttribute('data-height');
+    var statics = widgetPopinData.getAttribute('data-statics');
+
+    // Call to Mailjet CSS file
+    var cssFile = document.createElement('link');
+    cssFile.setAttribute('rel', 'stylesheet');
+    cssFile.setAttribute('type', 'text/css');
+    if (statics) {
+      base += '/' + statics;
+    }
+    cssFile.setAttribute('href', base + '/css/w-popin-less.css');
+    document.getElementsByTagName('head')[0].appendChild(cssFile);
+
+    var htmlCode =
+      '<div id="mj-w-overlay" style="display: none;">' +
+      '<div id="mj-w-popin-block" style="max-width:' +
+      width +
+      'px; max-height:' +
+      height +
+      'px">' +
+      '<div id="mj-w-loader"></div>' +
+      '<img id="mj-w-close-img" alt="' +
+      i8nMessages[locale]['close-popin'] +
+      '" title="' +
+      i8nMessages[locale]['close-popin'] +
+      '" src="' +
+      base +
+      '/images/w-popin-close.png" style="display:none;" />' +
+      '<iframe id="mj-w-iframe" src="' +
+      base +
+      '/widget/iframe/' +
+      apiKey +
+      '/' +
+      wId +
+      '" scrolling="no" width="100% "   frameborder="0" allotransparency="true" style="background-color:transparent; border-radius:3px;height: 0px;">' +
+      '<p>' +
+      i8nMessages[locale]['iframe-error'] +
+      '</p>' +
+      '</iframe>' +
+      '</div>' +
+      '</div>';
+
+    widgetPopinData.innerHTML = htmlCode;
+
+    document.getElementById('mj-w-iframe').onload = function() {
+      document.getElementById('mj-w-iframe').style.height = height + 'px';
+      document.getElementById('mj-w-close-img').style.display = 'block';
+      document.getElementById('mj-w-loader').style.display = 'none';
+      document.getElementById('mj-w-popin-block').style.border = 'none';
+      if (window.matchMedia('(max-width: 767px)').matches) {
+        document.getElementById('mj-w-iframe').style.width = '100%';
+        document.getElementById('mj-w-popin-block').style.height = 'auto';
+        document.getElementById('mj-w-popin-block').style.width = '90%';
+      }
+    };
+
+    var closeImgNode = document.getElementById('mj-w-close-img');
+    closeImgNode.addEventListener('click', function(event) {
+      closePopin();
+      event.preventDefault();
+    });
+
+    document.addEventListener('keydown', escapeEvent);
+    document.getElementById('mj-w-iframe').onclick = function(event) {
+      event.stopPropagation();
+    };
+    //document.addEventListener("click");
+
+    document.getElementById('mj-w-overlay').style.display = 'block';
+    document
+      .getElementById('mj-w-overlay')
+      .addEventListener('click', function(event) {
+        closePopin();
+        event.preventDefault();
+      });
+  }
+}
+
+// Escape event : close popin
+function escapeEvent(e) {
+  if (e.keyCode == 27) {
+    // Escape key
+    closePopin();
+  }
+}
+
+// Close popin (remove popin HTML code)
+function closePopin() {
+  var rootContainer = document.getElementById('mj-w-overlay');
+  if (rootContainer) {
+    rootContainer.parentNode.removeChild(rootContainer);
+  }
+  document.removeEventListener('keypress', escapeEvent);
+}
+
+addEventListener('load', () => {
+  // Display popin when click event occure on widget button
+  for (let btnNode of document.getElementsByClassName('mj-w-btn')) {
+    btnNode.style.cursor = 'pointer';
+    btnNode.addEventListener('click', function(event) {
+      mjOpenPopin(event, this);
+    });
+  }
+});
+
+addEventListener('resize', () => {
+  if (window.matchMedia('(max-width: 767px)').matches) {
+    const popin = document.getElementById('mj-w-popin-block');
+    const iframe = document.getElementById('mj-w-iframe');
+    if (popin) {
+      popin.style.height = 'auto';
+      popin.style.width = '90%';
+    }
+    if (iframe) {
+      iframe.style.width = '100%';
+    }
+  }
+});
+
+window.mjOpenPopin = mjOpenPopin;
diff --git a/app/views/layouts/_mailjet_newsletter.html.haml b/app/views/layouts/_mailjet_newsletter.html.haml
index e290caf30..58930a243 100644
--- a/app/views/layouts/_mailjet_newsletter.html.haml
+++ b/app/views/layouts/_mailjet_newsletter.html.haml
@@ -1,2 +1,2 @@
 %data.mj-w-data{ "data-apikey" => "1v5T", "data-base" => "https://app.mailjet.com", "data-height" => "328", "data-lang" => "fr_FR", "data-statics" => "statics", "data-token" => "11c89e7ddb46fbcdcb7f8fe5fdfca818", "data-w-id" => "39b", "data-width" => "640", "value" => "mj" }
-= javascript_include_tag 'mailjet', "data-turbolinks-eval": false
+= javascript_pack_tag 'mailjet', defer: true, 'data-turbolinks-eval': false
diff --git a/config/application.rb b/config/application.rb
index 6e5f62433..7d54fd628 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -25,7 +25,7 @@ module TPS
     config.autoload_paths += %W(#{config.root}/lib #{config.root}/app/validators #{config.root}/app/facades)
     config.assets.paths << Rails.root.join('app', 'assets', 'javascript')
     config.assets.paths << Rails.root.join('app', 'assets', 'fonts')
-    config.assets.precompile += %w(.woff mailjet.js)
+    config.assets.precompile += %w(.woff)
 
     if Rails.env.production?
       URL = "https://www.demarches-simplifiees.fr/"