diff --git a/.gitignore b/.gitignore
index dc0910df..c573351f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ public/upload.js
 public/download.js
 public/version.json
 public/l20n.min.js
+public/polyfill.min.js
 static/*
 !static/info.txt
 test/frontend/bundle.js
diff --git a/package-lock.json b/package-lock.json
index 756be485..c65b2a09 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -263,6 +263,43 @@
         "js-tokens": "3.0.2"
       }
     },
+    "babel-polyfill": {
+      "version": "6.23.0",
+      "resolved": "https://registry.npmjs.org/babel-polyfill/-/babel-polyfill-6.23.0.tgz",
+      "integrity": "sha1-g2TKYt+Or7gwSZ9pkXdGbDsDSZ0=",
+      "dev": true,
+      "requires": {
+        "babel-runtime": "6.25.0",
+        "core-js": "2.4.1",
+        "regenerator-runtime": "0.10.5"
+      },
+      "dependencies": {
+        "core-js": {
+          "version": "2.4.1",
+          "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.4.1.tgz",
+          "integrity": "sha1-TekR5mew6ukSTjQlS1OupvxhjT4=",
+          "dev": true
+        }
+      }
+    },
+    "babel-runtime": {
+      "version": "6.25.0",
+      "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.25.0.tgz",
+      "integrity": "sha1-M7mOql1IK7AajRqmtDetKwGuxBw=",
+      "dev": true,
+      "requires": {
+        "core-js": "2.4.1",
+        "regenerator-runtime": "0.10.5"
+      },
+      "dependencies": {
+        "core-js": {
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+          "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.4.1.tgz",
+          "integrity": "sha1-TekR5mew6ukSTjQlS1OupvxhjT4=",
+          "dev": true
+        }
+      }
+    },
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       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -271,12 +308,12 @@
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-      "integrity": "sha1-qRlH2h9KUW6jjltOwOw3c2deCIY="
+      "integrity": "sha512-dwVUVIXsBZXwTuwnXI9RK8sBmgq09NDHzyR9SAph9eqk76gKK2JSQmZARC2zRC81JC2QTtxD0ARU5qTS25gIGw=="
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-      "integrity": "sha1-3bBI5Q2UgnkAlME+s/z8gzznq0Y=",
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       "dev": true
     },
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@@ -451,7 +488,7 @@
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-          "integrity": "sha1-wZyd+aAocC1nhhI4SmVSQExjbRU=",
+          "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
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@@ -480,7 +517,7 @@
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-          "integrity": "sha1-D8Z9fBQYJd6UKC3VNr7GubzoYKs=",
+          "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
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@@ -917,65 +954,75 @@
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-        "minimist": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-        "moment": "https://registry.npmjs.org/moment/-/moment-2.17.1.tgz",
-        "validator": "https://registry.npmjs.org/validator/-/validator-7.0.0.tgz",
-        "varify": "https://registry.npmjs.org/varify/-/varify-0.2.0.tgz"
+        "depd": "1.1.0",
+        "json5": "0.5.1",
+        "lodash.clonedeep": "4.5.0",
+        "minimist": "1.2.0",
+        "moment": "2.17.1",
+        "validator": "7.0.0",
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-          "version": "https://registry.npmjs.org/depd/-/depd-1.1.0.tgz",
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+          "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.0.tgz",
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-          "version": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
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+          "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
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-          "version": "https://registry.npmjs.org/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz",
+          "version": "4.5.0",
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-          "version": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
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-          "version": "https://registry.npmjs.org/validator/-/validator-7.0.0.tgz",
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-          "version": "https://registry.npmjs.org/varify/-/varify-0.2.0.tgz",
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-            "through": "https://registry.npmjs.org/through/-/through-2.3.8.tgz"
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-              "version": "https://registry.npmjs.org/redeyed/-/redeyed-1.0.1.tgz",
+              "version": "1.0.1",
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+                "esprima": "3.0.0"
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-                  "version": "https://registry.npmjs.org/esprima/-/esprima-3.0.0.tgz",
+                  "version": "3.0.0",
+                  "resolved": "https://registry.npmjs.org/esprima/-/esprima-3.0.0.tgz",
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-              "version": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
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@@ -1302,7 +1349,7 @@
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-          "integrity": "sha1-D8Z9fBQYJd6UKC3VNr7GubzoYKs=",
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@@ -1526,7 +1573,7 @@
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-      "integrity": "sha1-1PMUSEqAsbYTuMiIboT1Lv4VJsI=",
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@@ -1730,7 +1777,7 @@
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-          "integrity": "sha1-I9hlaxaq5nQqwpcy6o8DNqR4nPI=",
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@@ -2002,7 +2049,7 @@
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-      "integrity": "sha1-qjiWs+abSH8X4x7SFD1pqOMMLYo=",
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@@ -2947,7 +2994,7 @@
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           "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-          "integrity": "sha1-D8Z9fBQYJd6UKC3VNr7GubzoYKs=",
+          "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
           "dev": true,
           "requires": {
             "safe-buffer": "5.1.1"
diff --git a/package.json b/package.json
index ff012aae..6f02954a 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,7 @@
     "redis": "^2.7.1"
   },
   "devDependencies": {
+    "babel-polyfill": "^6.23.0",
     "browserify": "^14.4.0",
     "eslint": "^4.3.0",
     "eslint-plugin-mocha": "^4.11.0",
@@ -79,7 +80,7 @@
     "build:upload": "browserify frontend/src/upload.js -g uglifyify -o public/upload.js",
     "build:download": "browserify frontend/src/download.js -g uglifyify -o public/download.js",
     "build:version": "node scripts/version",
-    "build:l10n": "cp node_modules/l20n/dist/web/l20n.min.js public",
+    "build:vendor": "cp node_modules/l20n/dist/web/l20n.min.js node_modules/babel-polyfill/dist/polyfill.min.js public",
     "dev": "npm run build && npm start",
     "format": "prettier '{frontend/src/,scripts/,server/,test/**/!(bundle)}*.js' 'public/*.css' --single-quote --write",
     "lint": "npm-run-all lint:*",
diff --git a/views/layouts/main.handlebars b/views/layouts/main.handlebars
index c5407bcc..b34d922b 100644
--- a/views/layouts/main.handlebars
+++ b/views/layouts/main.handlebars
@@ -12,6 +12,7 @@
 
   <link rel="icon" type="image/png" href="/resources/favicon-32x32.png" sizes="32x32" />
   <link rel="localization" href="/locales/{locale}/send.ftl">
+  <script src="/polyfill.min.js"></script>
   <script defer src="/l20n.min.js"></script>
 </head>
 <body>