This is a simple typo fix. Doesn't make sense (and is bad) to get properties from the provisional document loader when the load is far past being provisional. :)
Created attachment 18873 [details] Get the URL from documentLoader instead of provisionalDocumentLoader()
Comment on attachment 18873 [details] Get the URL from documentLoader instead of provisionalDocumentLoader() r=me
Landed in r29957. Thanks!