<p>When working with Silverlight, I've noticed that Firefox will cache the XAP file, so if I do an update, a user may be stuck using an outdated version.  Is there a way to force the browser to either re-download the XAP file every time, or maybe only force it to after an update has been published?  Or is there a setting in the Silverlight config that stops the browser from caching the XAP file altogether?</p>

<p>Thanks,
jeff</p>

You could send HTTP headers to prevent it from caching:
```
```
Cache-control: no-cache
Pragma: no-cache
```
```
How you do this depends on the web server you're using.