Could this be related to the following issue
http://code.google.com/p/fbug/issues/detail?id=2434

Honza

On Oct 7, 9:30 am, mikewse <mike...@gmail.com> wrote:
> On Oct 7, 5:28 am, John J Barton <johnjbar...@johnjbarton.com> wrote:
>
> > Yes, please help me understand what a NTLM is.
>
> In short, NTLM is a Microsoft authentication protocol that is used in
> their products for single sign-on, so that the "Windows" login may be
> used for transparently logging in to web sites. NTLM is used
> extensively in large corporations for intranet sites and similar, and
> is widely implemented in web browsers from other vendors, including
> Firefox.
> Overview:http://en.wikipedia.org/wiki/NTLM
> Gory reverse-engineering details:http://davenport.sourceforge.net/ntlm.html
>
> Fetching a resource over NTLM means doing three requests:
>
> GET /index.html
> HTTP/1.1 401 Unauthorized ("I want NTLM" in header)
>
> GET /index.html (NTLM Type1 message in header)
> HTTP/1.1 401 Unauthorized (NTLM Type2 message in header)
>
> GET /index.html (NTLM Type3 message in header)
> HTTP/1.1 200 OK (resource fetched)
>
> so seeing the first block of the script being repeated three times
> doesn't seem like a coincident. I guess the two body-less 401
> responses incorrectly lead to writing copies of the first 4KB to the
> internal resource buffer. (Note that Firefox view source gets it right
> so this a Firebug problem)
>
> The following Firebug issues describe other dimensions of this
> problem:http://code.google.com/p/fbug/issues/detail?id=1902http://code.google.com/p/fbug/issues/detail?id=1927
>
> Just let me know if there's anything else I can do to help
> Mike

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