Re: Retrieving a webpages shows a blank screen when a 4xx HTTP status is returned. Not helpfull.

Dave,

> This?
> https://addons.thunderbird.net/en-GB/seamonkey/addon/live-http-headers/
> I remember using that once.
> You may need to fiddle with install.rdf

:-) fiddle indeed.  Max version FF 4.0.   I would probably have ignored it 
if I found it myself.

But with most roads being blocked off I'm going to take a look at it and see 
what happens.   Thanks.

Regards,
Rudy Wieser