got webpack production mode running

app/fileReceiver.js

@@ -104,6 +104,7 @@ export default class FileReceiver extends Nanobus {
         request: 'init',
         id: this.fileInfo.id,
         filename: this.fileInfo.name,
+        type: this.fileInfo.type,
         key: this.fileInfo.secretKey,
         requiresPassword: this.fileInfo.requiresPassword,
         password: this.fileInfo.password,
@@ -128,7 +129,6 @@ export default class FileReceiver extends Nanobus {
         a.href = downloadUrl;
         document.body.appendChild(a);
         a.click();
-        URL.revokeObjectURL(downloadUrl);
       }
 
       let prog = 0;
@@ -139,7 +139,7 @@ export default class FileReceiver extends Nanobus {
         });
         prog = msg.progress;
         onprogress([prog, this.fileInfo.size]);
-        await delay();
+        await delay(1000);
       }
 
       this.downloadRequest = null;

app/serviceWorker.js

@@ -34,6 +34,7 @@ async function decryptStream(request) {
 
     const headers = {
       'Content-Disposition': 'attachment; filename=' + file.filename,
+      'Content-Type': file.type,
       'Content-Length': file.size
     };
 
@@ -61,6 +62,7 @@ self.onmessage = event => {
     const info = {
       keychain: new Keychain(event.data.key),
       filename: event.data.filename,
+      type: event.data.type,
       size: event.data.size,
       progress: 0,
       cancelled: false