diff --git a/extension/background/emscriptif.js b/extension/background/emscriptif.js
index 62b233eda..ceed32c97 100644
--- a/extension/background/emscriptif.js
+++ b/extension/background/emscriptif.js
@@ -13,87 +13,10 @@
 
   You should have received a copy of the GNU General Public License along with
   TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
-
-
 */
 
+"use strict";
 
-var EXPORTED_SYMBOLS = [
-  'TWRhelloWorld',
-  'TWRgetValue',
-  'TWRgetFraction',
-  'TWRgetCurrency',
-  'TamountCmp',
-  'TWRverifyConfirmation',
-  'TWRverifySignKey',
-  'TWRverifyDenom',
-  'TWRverifyDenoms',
-  'TWRALLrsaPublicKeyHash',
-  'TWRALLgetEncodingFromRsaSignature',
-  'DWRtestStringCmp',
-  'TWRmultiplyAmount',
-  'TWRmultiplyAmounts',
-  'DWRdumpAmount',
-  'TWRALLgetAmount',
-  'DWRtestString',
-  'DWRgetPurpose',
-  'TWReddsaVerify',
-  'TamountAdd',
-  'TamountSubtract',
-  'TWRALLmakeEddsaSignature',
-  'TWRALLamountAdd',
-  'TWRALLeddsaPublicKeyFromPrivate',
-  'TWRALLeddsaPublicKeyFromPrivString',
-  'TWRALLeddsaPrivateKeyFromString',
-  'TWRALLeccEcdh',
-  'TWRALLhash',
-  'TWRALLecdhePublicKeyFromPrivateKey',
-  'TWRALLrsaPublicKeyDecodeFromString',
-  'GCeddsaSign',
-  'TWRALLmakeWithdrawBundle',
-  'GCALLrsaSignatureDecode',
-  'GCrsaSignatureEncode',
-  'TWRALLsignDepositPermission',
-  'GCALLrsaPublicKeyDecode',
-  'GCALLrsaPublicKeyEncode',
-  'WRALLeddsaPublicKey',
-  'GCALLeddsaKeyCreate',
-  'WRALLecdhePublicKey ',
-  'GSALLdataToStringAlloc',
-  'TWRgnunetFree',
-  'GSstringToData',
-  'TWRALLgetCurrentTime',
-  'TWRgetFancyTime',
-  'GChash',
-  'getHashedArray',
-  'TWRALLsignTest',
-  'GCALLecdheKeyCreate',
-  'GCecdheKeyGetPublic',
-  'WRALLecdhePublicKey',
-  'WRverifyTest',
-  'GCeccEcdh',
-  'TWRALLgenSymmetricKey',
-  'TWRALLgenInitVector',
-  'GCsymmetricDecrypt',
-  'GCsymmetricEncrypt',
-  'TWRALLgenKeyFromBlob',
-  'GCALLrsaPrivateKeyGetPublic',
-  'GCALLrsaPrivateKeyCreate',
-  'GCALLrsaBlindingKeyCreate',
-  'GCrsaBlindingKeyFree',
-  'GCrsaPublicKeyFree',
-  'GCrsaPrivateKeyFree',
-  'GCALLrsaBlind',
-  'GCALLrsaUnblind',
-  'GCALLrsaSign',
-  'GCrsaVerify',
-  'GCrsaSignatureFree',
-  'GCeddsaKeyGetPublic',
-  'WRALLmakePurpose',
-  'GChkdf',
-  'emscMalloc',
-  'emscFree'
-];
 
 /* The following definition is needed to make emscripted library to remain
   'alive' after its loading. Otherwise, the normal behaviour would be:
@@ -143,19 +66,15 @@ getLastWindow().Module = {
 
 // shortcut to emscr's 'malloc'
 function emscMalloc(size) {
-
   var ptr = Module._malloc(size);
   return ptr;
-
 }
 
 /* shortcut to emscr's 'free'. This function is problematic:
   it randomly stops working giving 'emscFree is not a function'
   error */
 function emscFree(ptr) {
-
   Module._free(ptr);
-
 }
 
 var getEmsc = Module.cwrap;
@@ -585,3 +504,22 @@ var TWRALLsignTest = getEmsc('TALER_WRALL_sign_test',
 var WRverifyTest = getEmsc('WR_verify_test',
                            'number',
 			  ['number']);
+
+
+let d2s = getEmsc('GNUNET_STRINGS_data_to_string_alloc',
+                  'string',
+                  ['number', 'number']);
+
+
+let sizeof_EddsaPrivateKey = 32;
+let sizeof_EddsaPublicKey = 32;
+
+
+function createEddsaKeyPair() {
+  let privPtr = GCALLeddsaKeyCreate();
+  let pubPtr = emscMalloc(sizeof_EddsaPublicKey);
+  GCeddsaKeyGetPublic(privPtr, pubPtr);
+  let privStr = d2s(privPtr, sizeof_EddsaPrivateKey);
+  let pubStr = d2s(pubPtr, sizeof_EddsaPublicKey);
+  return {priv: privStr, pub: pubStr};
+}
diff --git a/extension/background/wallet.js b/extension/background/wallet.js
index 1e8dd6a7c..2d3687f98 100644
--- a/extension/background/wallet.js
+++ b/extension/background/wallet.js
@@ -17,6 +17,8 @@ DB.open(function () {
   console.log ("DB: ready");
 });
 
+let DONE = 4;
+
 chrome.runtime.onMessage.addListener(
   function (req, sender, onresponse) {
     console.log("Message: " + req.type +
@@ -36,5 +38,38 @@ chrome.runtime.onMessage.addListener(
       case "db-list-reserves":
         DB.reserve_list (onresponse);
         break;
+      case "confirm-reserve":
+        console.log('detail: ' + JSON.stringify(req.detail));
+        let keypair = createEddsaKeyPair();
+        let form = new FormData();
+        form.append(req.detail.field_amount, req.detail.amount_str);
+        form.append(req.detail.field_reserve_pub, keypair.pub);
+        form.append(req.detail.field_mint, req.detail.mint);
+        // XXX: set bank-specified fields.
+        let myRequest = new XMLHttpRequest();
+        console.log("making request to " + req.detail.post_url);
+        myRequest.open('post', req.detail.post_url);
+        myRequest.send(form);
+        myRequest.addEventListener('readystatechange', (e) => {
+          if (myRequest.readyState == DONE) {
+            let resp = {};
+            resp.status = myRequest.status;
+            resp.text = myRequest.responseText;
+            switch (myRequest.status) {
+              case 200:
+                resp.success = true;
+                // We can't show the page directly, so
+                // we show some generic page from the wallet.
+                resp.backlink = chrome.extension.getURL("pages/reserve-success.html");
+                break;
+              default:
+                resp.success = false;
+            }
+            onresponse(resp);
+          }
+        });
+        // Allow async response
+        return true;
+        break;
     }
   });
diff --git a/extension/content_scripts/notify.js b/extension/content_scripts/notify.js
index 94356cf52..0fab0e6dc 100644
--- a/extension/content_scripts/notify.js
+++ b/extension/content_scripts/notify.js
@@ -18,6 +18,25 @@ document.addEventListener("DOMContentLoaded", function(e) {
     document.body.dispatchEvent(evt);
     console.log("bank handshake done");
   });
+  document.body.addEventListener('taler-create-reserve', function(e) {
+    let $ = (x) => document.getElementById(x);
+    console.log("taler-create-reserve with " + JSON.stringify(e.detail));
+    let form_uri = $(e.detail.form_id).action;
+    // TODO: validate event fields
+    // TODO: also send extra bank-defined form fields
+    let params = {
+      post_url: URI(form_uri).absoluteTo(document.location.href).href(),
+      // TODO: This should change in the future, we should not deal with the
+      // amount as a bank-specific string here.
+      amount_str: $(e.detail.input_amount).value,
+      // TODO:  This double indirection is way too much ...
+      field_amount: $(e.detail.input_amount).name,
+      field_reserve_pub: $(e.detail.input_pub).name,
+      field_mint: $(e.detail.mint_rcv).name,
+    };
+    let uri = URI(chrome.extension.getURL("pages/confirm-create-reserve.html"));
+    document.location.href = uri.query(params).href();
+  });
 });
 
 console.log("Taler wallet: content page loaded");
diff --git a/extension/manifest.json b/extension/manifest.json
index 9a1b1f3bf..0dad29ca6 100644
--- a/extension/manifest.json
+++ b/extension/manifest.json
@@ -26,12 +26,18 @@
       "matches": ["*://*/*"],
       "js": [
         "content_scripts/notify.js",
-        "lib/URI.js"
+        "lib/URI.js",
+        "lib/util.js"
       ],
       "run_at": "document_start"
     }
   ],
 
+  "web_accessible_resources": [
+    "pages/*",
+    "lib/*"
+  ],
+
   "background": {
     "scripts": [
       "lib/util.js",
diff --git a/extension/pages/confirm-create-reserve.html b/extension/pages/confirm-create-reserve.html
new file mode 100644
index 000000000..4a01e47d1
--- /dev/null
+++ b/extension/pages/confirm-create-reserve.html
@@ -0,0 +1,23 @@
+<!doctype html>
+
+<html>
+  <head>
+    <title>Taler Wallet: Confirm Reserve Creation</title>
+    <script src="../lib/URI.js"></script>
+    <script src="confirm-create-reserve.js"></script>
+    <link rel="stylesheet" type="text/css" href="../style/wallet.css"> 
+  </head>
+  <body>
+    <h1>Confirm Reserve Creation</h1>
+    Hello, this is the wallet.  A bank wants to create a reserve for <span id=show-amount>(loading...)</span>.
+    Please specify the base URL of the mint you want to use.
+    <p />
+    <div class='formish'>
+      <div class='form-row'>
+        <label for='mint-url'>Mint URL</label>
+        <input class='url' id='mint-url' type="text"></input>
+      </div>
+      <button id='confirm'>Confirm Reserve</button>
+    </div>
+  </body>
+</html>
diff --git a/extension/pages/confirm-create-reserve.js b/extension/pages/confirm-create-reserve.js
new file mode 100644
index 000000000..5c35121e3
--- /dev/null
+++ b/extension/pages/confirm-create-reserve.js
@@ -0,0 +1,43 @@
+"use strict";
+
+let url = URI(document.location.href);
+let query = URI.parseQuery(url.query());
+
+function updateAmount() {
+  let showAmount = document.getElementById("show-amount");
+  console.log("Query is " + JSON.stringify(query));
+  let s = query.amount_str;
+  if (!s) {
+    document.body.innerHTML = "Oops, something went wrong.";
+    return;
+  }
+  showAmount.textContent = s;
+}
+
+function clone(obj) {
+  // This is faster than it looks ...
+  return JSON.parse(JSON.stringify(obj));
+}
+
+document.addEventListener("DOMContentLoaded", (e) => {
+  updateAmount();
+
+  document.getElementById("confirm").addEventListener("click", (e) => {
+    let d = clone(query);
+    d.mint = document.getElementById('mint-url').value;
+    chrome.runtime.sendMessage({type:'confirm-reserve', detail: d}, (resp) => {
+      if (resp.success === true) {
+        document.location.href = resp.backlink;
+      } else {
+        document.body.innerHTML =
+          `Oops, something went wrong.
+           The bank responded with HTTP status code ${resp.status}.
+           Here is some more info:
+           <pre>${resp.text}</pre>`;
+      }
+    });
+
+  });
+});
+
+
diff --git a/extension/pages/reserve-success.html b/extension/pages/reserve-success.html
new file mode 100644
index 000000000..81de9cb41
--- /dev/null
+++ b/extension/pages/reserve-success.html
@@ -0,0 +1,12 @@
+<!doctype html>
+
+<html>
+  <head>
+    <title>Taler Wallet: Reserve Created</title>
+    <link rel="stylesheet" type="text/css" href="../style/wallet.css"> 
+  </head>
+  <body>
+    <h1>Success!</h1>
+    The reserve was created successfully.
+  </body>
+</html>
diff --git a/extension/style/wallet.css b/extension/style/wallet.css
new file mode 100644
index 000000000..ba698296a
--- /dev/null
+++ b/extension/style/wallet.css
@@ -0,0 +1,19 @@
+.form-row {
+  padding-top: 5px;
+  padding-bottom: 5px;
+}
+
+label {
+  padding-right: 1em;
+}
+
+label::after {
+  content: ":";
+}
+
+input.url {
+  width: 25em;
+}
+
+.formish {
+}