sorry, I still don't see where this package etag comes from...

In the packaged.webapp manifest, the package URL is `https://marketplace.cdn.mozilla.net/media/packaged-apps/yulelog_prod_2013.04.01_17.40.15.zip`; and when I run `curl -I https://marketplace.cdn.mozilla.net/media/packaged-apps/yulelog_prod_2013.04.01_17.40.15.zip` I get:

```
HTTP/1.1 200 OK
Server: nginx
X-Backend-Server: web2.addons.phx1.mozilla.com
Content-Type: application/zip
Accept-Ranges: bytes
Last-Modified: Tue, 02 Apr 2013 18:16:33 GMT
Content-Length: 7580
Cache-Control: max-age=315221419
Expires: Thu, 06 Apr 2023 18:35:52 GMT
Date: Wed, 10 Apr 2013 09:05:33 GMT
Connection: keep-alive
```

So I see no ETag here.

I originally thought we wouldd get an update at the first start, but actually we're not, because the correct manifest ETag makes the Webapps subsystem not check the package at all.

So I think you could actually just get rid of the package ETag here after all.