You can use Firebug in combination with the extension
NetExport.
When NetExport is
installed, open Firebug (via
F12), switch to the
Net panel and activate it via its options menu. Then reload the page. You'll see several network requests listed. To save the data behind those requests (as HAR file) click
Export >
Save as... This file will automatically be uploaded to
http://www.softwareishard.com/har/viewer/ and displayed there. You can then send that HAR file to your service provider and tell them that they can display that file on the HAR viewer page mentioned before.
Hope that helps.
Sebastian