diff --git a/extension/lib/util.ts b/extension/lib/util.ts
deleted file mode 100644
index f2fdb131a..000000000
--- a/extension/lib/util.ts
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- This file is part of TALER
- (C) 2015 GNUnet e.V.
-
- TALER is free software; you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the Free Software
- Foundation; either version 3, or (at your option) any later version.
-
- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License along with
- TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
- */
-
-'use strict';
-
-/**
- * Parse an amount that is specified like '5.42 EUR'.
- * Returns a {currency,value,fraction} object or null
- * if the input is invalid.
- */
-function amount_parse_pretty(s) {
-  let pattern = /(\d+)(.\d+)?\s*([a-zA-Z]+)/;
-  let matches = pattern.exec(s);
-  if (null == matches) {
-    return null;
-  }
-  return {
-    // Always succeeds due to regex
-    value: parseInt(matches[1]),
-    // Should we warn / fail on lost precision?
-    fraction: Math.round(parseFloat(matches[2] || "0") * 1000000),
-    currency: matches[3],
-  };
-}
-
-
-function format(s: string, ...args: any[]) {
-  function r(m, n) {
-    let i = parseInt(n);
-    return args[i];
-  }
-  s = s.replace(/{{/g, '{');
-  s = s.replace(/}}/g, '}');
-  s = s.replace(/{([0-9]+)}/g, r);
-  return s;
-}
-
-
-function promiseFinally<T>(p: Promise<T>, fn): Promise<T> {
-  return p.then((x) => { fn(); return x; })
-          .catch((e) => {fn(); throw e;});
-}
diff --git a/extension/lib/wallet/emscriptif.ts b/extension/lib/wallet/emscriptif.ts
index d8fd72289..eb6a292a7 100644
--- a/extension/lib/wallet/emscriptif.ts
+++ b/extension/lib/wallet/emscriptif.ts
@@ -595,7 +595,7 @@ export class HashCode extends PackedArenaObject {
         qual = RandomQuality.NONCE;
         break;
       default:
-        throw Error(format("unknown crypto quality: {0}", qual));
+        throw Error(`unknown crypto quality: ${qual}`);
     }
     this.alloc();
     emsc.hash_create_random(qual, this.nativePtr);
@@ -680,7 +680,7 @@ abstract class SignatureStruct {
       let name = f[0];
       let member = this.members[name];
       if (!member) {
-        throw Error(format("Member {0} not set", name));
+        throw Error(`Member ${name} not set`);
       }
       totalSize += member.size();
     }
@@ -705,7 +705,7 @@ abstract class SignatureStruct {
       let name = f[0];
       let member = this.members[name];
       if (!member) {
-        throw Error(format("Member {0} not set", name));
+        throw Error(`Member ${name} not set`);
       }
       res[name] = member.toJson();
     }
@@ -719,10 +719,10 @@ abstract class SignatureStruct {
       typemap[f[0]] = f[1];
     }
     if (!(name in typemap)) {
-      throw Error(format("Key {0} not found", name));
+      throw Error(`Key ${name} not found`);
     }
     if (!(value instanceof typemap[name])) {
-      throw Error(format("Wrong type for {0}", name));
+      throw Error("Wrong type for ${name}");
     }
     this.members[name] = value;
   }
diff --git a/extension/lib/wallet/wxmessaging.js b/extension/lib/wallet/wxmessaging.js
index c656f2632..7a6f501be 100644
--- a/extension/lib/wallet/wxmessaging.js
+++ b/extension/lib/wallet/wxmessaging.js
@@ -98,7 +98,7 @@ System.register(["./wallet", "./db", "./http"], function(exports_1) {
                 if (req.type in handlers) {
                     return handlers[req.type](db, req.detail, onresponse);
                 }
-                console.error(format("Request type {1} unknown, req {0}", JSON.stringify(req), req.type));
+                console.error("Request type " + JSON.stringify(req) + " unknown, req " + req.type);
                 return false;
             });
         });
diff --git a/extension/lib/wallet/wxmessaging.ts b/extension/lib/wallet/wxmessaging.ts
index 1b345e22f..6c8f77a8b 100644
--- a/extension/lib/wallet/wxmessaging.ts
+++ b/extension/lib/wallet/wxmessaging.ts
@@ -127,9 +127,7 @@ export function wxMain() {
         if (req.type in handlers) {
           return handlers[req.type](db, req.detail, onresponse);
         }
-        console.error(format("Request type {1} unknown, req {0}",
-                             JSON.stringify(req),
-                             req.type));
+        console.error(`Request type ${JSON.stringify(req)} unknown, req ${req.type}`);
         return false;
       });
   });
diff --git a/extension/manifest.json b/extension/manifest.json
index b7991e3f3..619d986a2 100644
--- a/extension/manifest.json
+++ b/extension/manifest.json
@@ -28,7 +28,6 @@
       "js": [
         "lib/vendor/system.src.js",
         "lib/vendor/URI.js",
-        "lib/util.js",
         "content_scripts/notify.js"
       ],
       "run_at": "document_start"
@@ -44,7 +43,6 @@
     "scripts": [
       "lib/vendor/URI.js",
       "lib/vendor/handlebars-v4.0.5.js",
-      "lib/util.js",
       "lib/emscripten/libwrapper.js",
       "lib/vendor/system.src.js",
       "background/main.js"
diff --git a/extension/popup/balance-overview.html b/extension/popup/balance-overview.html
index 166908bbc..b27a9353a 100644
--- a/extension/popup/balance-overview.html
+++ b/extension/popup/balance-overview.html
@@ -4,7 +4,6 @@
 <head>
   <meta charset="utf-8">
   <link rel="stylesheet" href="popup.css" type="text/css">
-  <script src="../lib/util.js" type="text/javascript"></script>
   <script src="../lib/vendor/handlebars-v4.0.5.js" type="text/javascript"></script>
   <script src="../lib/commonHelpers.js" type="text/javascript"></script>
   <script src="balance-overview.js" type="text/javascript"></script>
diff --git a/extension/popup/history.html b/extension/popup/history.html
index dccc84605..0b211d8af 100644
--- a/extension/popup/history.html
+++ b/extension/popup/history.html
@@ -4,7 +4,6 @@
 <head>
   <meta charset="utf-8">
   <link rel="stylesheet" href="popup.css" type="text/css">
-  <script src="../lib/util.js" type="text/javascript"></script>
   <script src="history.js" type="text/javascript"></script>
 
   <script id="balance-template" type="text/x-handlebars-template">
diff --git a/extension/tsconfig.json b/extension/tsconfig.json
index 4d220b601..e76d322af 100644
--- a/extension/tsconfig.json
+++ b/extension/tsconfig.json
@@ -17,7 +17,6 @@
       "lib/wallet/checkable.ts",
       "lib/wallet/wxmessaging.ts",
       "lib/wallet/types.ts",
-      "lib/util.ts",
       "lib/commonHelpers.ts",
       "lib/polyfill-react.ts",
       "lib/wallet/timerThread.ts",